diff --git a/app/models/project.rb b/app/models/project.rb
index 8315a48a..eb0da23a 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -75,7 +75,7 @@ class Project < ActiveRecord::Base
   validates_length_of :homepage, :maximum => 255
   validates_length_of :identifier, :in => 1..IDENTIFIER_MAX_LENGTH
   # donwcase letters, digits, dashes but not digits only
-  validates_format_of :identifier, :with => /^(?!\d+$)[a-z0-9\-]*$/, :if => Proc.new { |p| p.identifier_changed? }
+  validates_format_of :identifier, :with => /^(?!\d+$)[a-z0-9\-_]*$/, :if => Proc.new { |p| p.identifier_changed? }
   # reserved words
   validates_exclusion_of :identifier, :in => %w( new )
 
diff --git a/config/locales/bg.yml b/config/locales/bg.yml
index 66d7233b..47e4803c 100644
--- a/config/locales/bg.yml
+++ b/config/locales/bg.yml
@@ -864,7 +864,7 @@ bg:
   text_tip_issue_begin_day: задача, започваща този ден
   text_tip_issue_end_day: задача, завършваща този ден
   text_tip_issue_begin_end_day: задача, започваща и завършваща този ден
-  text_project_identifier_info: 'Позволени са малки букви (a-z), цифри и тирета.<br />Невъзможна промяна след запис.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "До %{count} символа."
   text_caracters_minimum: "Минимум %{count} символа."
   text_length_between: "От %{min} до %{max} символа."
diff --git a/config/locales/bs.yml b/config/locales/bs.yml
index f2e58b60..68229f24 100644
--- a/config/locales/bs.yml
+++ b/config/locales/bs.yml
@@ -756,7 +756,7 @@ bs:
   text_tip_issue_begin_day: zadatak počinje danas
   text_tip_issue_end_day: zadatak završava danas
   text_tip_issue_begin_end_day: zadatak započinje i završava danas
-  text_project_identifier_info: 'Samo mala slova (a-z), brojevi i crtice su dozvoljeni.<br />Nakon snimanja, identifikator se ne može mijenjati.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "maksimum %{count} karaktera."
   text_caracters_minimum: "Dužina mora biti najmanje %{count} znakova."
   text_length_between: "Broj znakova između %{min} i %{max}."
diff --git a/config/locales/ca.yml b/config/locales/ca.yml
index 8d3eddda..e9dd73ba 100644
--- a/config/locales/ca.yml
+++ b/config/locales/ca.yml
@@ -848,7 +848,7 @@ ca:
   text_tip_issue_begin_day: "tasca que s'inicia aquest dia"
   text_tip_issue_end_day: tasca que finalitza aquest dia
   text_tip_issue_begin_end_day: "tasca que s'inicia i finalitza aquest dia"
-  text_project_identifier_info: "Es permeten lletres en minúscules (a-z), números i guions.<br />Un cop desat, l'identificador no es pot modificar."
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} caràcters com a màxim."
   text_caracters_minimum: "Com a mínim ha de tenir %{count} caràcters."
   text_length_between: "Longitud entre %{min} i %{max} caràcters."
diff --git a/config/locales/cs.yml b/config/locales/cs.yml
index c2ca9d70..39bb5a0f 100644
--- a/config/locales/cs.yml
+++ b/config/locales/cs.yml
@@ -661,7 +661,7 @@ cs:
   text_tip_issue_begin_day: úkol začíná v tento den
   text_tip_issue_end_day: úkol končí v tento den
   text_tip_issue_begin_end_day: úkol začíná a končí v tento den
-  text_project_identifier_info: 'Jsou povolena malá písmena (a-z), čísla a pomlčky.<br />Po uložení již není možné identifikátor změnit.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} znaků maximálně."
   text_caracters_minimum: "Musí být alespoň %{count} znaků dlouhé."
   text_length_between: "Délka mezi %{min} a %{max} znaky."
diff --git a/config/locales/da.yml b/config/locales/da.yml
index e909947a..da3110c0 100644
--- a/config/locales/da.yml
+++ b/config/locales/da.yml
@@ -663,7 +663,7 @@ da:
   text_tip_issue_begin_day: opgaven begynder denne dag
   text_tip_issue_end_day: opaven slutter denne dag
   text_tip_issue_begin_end_day: opgaven begynder og slutter denne dag
-  text_project_identifier_info: 'Små bogstaver (a-z), numre og bindestreg er tilladt.<br />Denne er en unik identifikation for projektet, og kan defor ikke rettes senere.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "max %{count} karakterer."
   text_caracters_minimum: "Skal være mindst %{count} karakterer lang."
   text_length_between: "Længde skal være mellem %{min} og %{max} karakterer."
diff --git a/config/locales/de.yml b/config/locales/de.yml
index 9e583fb1..bcd40156 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -866,7 +866,7 @@ de:
   text_tip_issue_begin_day: Aufgabe, die an diesem Tag beginnt
   text_tip_issue_end_day: Aufgabe, die an diesem Tag endet
   text_tip_issue_begin_end_day: Aufgabe, die an diesem Tag beginnt und endet
-  text_project_identifier_info: 'Kleinbuchstaben (a-z), Ziffern und Bindestriche erlaubt.<br />Einmal gespeichert, kann die Kennung nicht mehr geändert werden.'
+  text_project_identifier_info: 'Kleinbuchstaben (a-z), Ziffern, Binde- und Unterstriche erlaubt.<br />Einmal gespeichert, kann die Kennung nicht mehr geändert werden.'
   text_caracters_maximum: "Max. %{count} Zeichen."
   text_caracters_minimum: "Muss mindestens %{count} Zeichen lang sein."
   text_length_between: "Länge zwischen %{min} und %{max} Zeichen."
diff --git a/config/locales/el.yml b/config/locales/el.yml
index 8202c334..934caa07 100644
--- a/config/locales/el.yml
+++ b/config/locales/el.yml
@@ -767,7 +767,7 @@ el:
   text_tip_issue_begin_day: καθήκοντα που ξεκινάνε σήμερα
   text_tip_issue_end_day: καθήκοντα που τελειώνουν σήμερα
   text_tip_issue_begin_end_day: καθήκοντα που ξεκινάνε και τελειώνουν σήμερα
-  text_project_identifier_info: 'Επιτρέπονται μόνο μικρά πεζά γράμματα (a-z), αριθμοί και παύλες. <br /> Μετά την αποθήκευση, το αναγνωριστικό δεν μπορεί να αλλάξει.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "μέγιστος αριθμός %{count} χαρακτήρες."
   text_caracters_minimum: "Πρέπει να περιέχει τουλάχιστον %{count} χαρακτήρες."
   text_length_between: "Μήκος μεταξύ %{min} και %{max} χαρακτήρες."
diff --git a/config/locales/en-GB.yml b/config/locales/en-GB.yml
index 5276ecca..418b7979 100644
--- a/config/locales/en-GB.yml
+++ b/config/locales/en-GB.yml
@@ -832,7 +832,7 @@ en-GB:
   text_tip_issue_begin_day: task beginning this day
   text_tip_issue_end_day: task ending this day
   text_tip_issue_begin_end_day: task beginning and ending this day
-  text_project_identifier_info: 'Only lower case letters (a-z), numbers and dashes are allowed.<br />Once saved, the identifier can not be changed.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} characters maximum."
   text_caracters_minimum: "Must be at least %{count} characters long."
   text_length_between: "Length between %{min} and %{max} characters."
@@ -877,8 +877,8 @@ en-GB:
   default_role_manager: Manager
   default_role_developer: Developer
   default_role_reporter: Reporter
-  default_role_non_member: Non member
-  default_role_anonymous: Anonymous
+  default_role_non_member: Non member
+  default_role_anonymous: Anonymous
   default_tracker_bug: Bug
   default_tracker_feature: Feature
   default_tracker_support: Support
@@ -942,4 +942,4 @@ en-GB:
   setting_commit_logtime_enabled: Enable time logging
   notice_gantt_chart_truncated: The chart was truncated because it exceeds the maximum number of items that can be displayed (%{max})
   setting_gantt_items_limit: Maximum number of items displayed on the gantt chart
-  text_powered_by: "Powered by %{link}"
+  text_powered_by: "Powered by %{link}"
diff --git a/config/locales/en.yml b/config/locales/en.yml
index a188f5e2..b55f9bb2 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -864,7 +864,7 @@ en:
   text_tip_issue_begin_day: issue beginning this day
   text_tip_issue_end_day: issue ending this day
   text_tip_issue_begin_end_day: issue beginning and ending this day
-  text_project_identifier_info: 'Only lower case letters (a-z), numbers and dashes are allowed.<br />Once saved, the identifier can not be changed.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} characters maximum."
   text_caracters_minimum: "Must be at least %{count} characters long."
   text_length_between: "Length between %{min} and %{max} characters."
diff --git a/config/locales/es.yml b/config/locales/es.yml
index e45ff29e..84cb87b1 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -813,7 +813,7 @@ es:
   text_min_max_length_info: 0 para ninguna restricción
   text_no_configuration_data: "Todavía no se han configurado perfiles, ni tipos, estados y flujo de trabajo asociado a peticiones. Se recomiendo encarecidamente cargar la configuración por defecto. Una vez cargada, podrá modificarla."
   text_project_destroy_confirmation: ¿Estás seguro de querer eliminar el proyecto?
-  text_project_identifier_info: 'Letras minúsculas (a-z), números y signos de puntuación permitidos.<br />Una vez guardado, el identificador no puede modificarse.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_reassign_time_entries: 'Reasignar las horas a esta petición:'
   text_regexp_info: ej. ^[A-Z0-9]+$
   text_repository_usernames_mapping: "Establezca la correspondencia entre los usuarios de Redmine y los presentes en el log del repositorio.\nLos usuarios con el mismo nombre o correo en Redmine y en el repositorio serán asociados automáticamente."
diff --git a/config/locales/eu.yml b/config/locales/eu.yml
index 23a8cf96..c48ec2fc 100644
--- a/config/locales/eu.yml
+++ b/config/locales/eu.yml
@@ -827,7 +827,7 @@ eu:
   text_tip_issue_begin_day: gaur hasten diren atazak
   text_tip_issue_end_day: gaur bukatzen diren atazak
   text_tip_issue_begin_end_day: gaur hasi eta bukatzen diren atazak
-  text_project_identifier_info: 'Letra xeheak (a-z), zenbakiak eta marrak erabil daitezke bakarrik.<br />Gorde eta gero identifikadorea ezin da aldatu.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} karaktere gehienez."
   text_caracters_minimum: "Gutxienez %{count} karaktereetako luzerakoa izan behar du."
   text_length_between: "Luzera %{min} eta %{max} karaktereen artekoa."
@@ -872,8 +872,8 @@ eu:
   default_role_manager: Kudeatzailea
   default_role_developer: Garatzailea
   default_role_reporter: Berriemailea
-  default_role_non_member: Non member
-  default_role_anonymous: Anonymous
+  default_role_non_member: Non member
+  default_role_anonymous: Anonymous
   default_tracker_bug: Errorea
   default_tracker_feature: Eginbidea
   default_tracker_support: Laguntza
@@ -942,4 +942,4 @@ eu:
   setting_commit_logtime_enabled: Enable time logging
   notice_gantt_chart_truncated: The chart was truncated because it exceeds the maximum number of items that can be displayed (%{max})
   setting_gantt_items_limit: Maximum number of items displayed on the gantt chart
-  text_powered_by: Powered by %{link}
+  text_powered_by: Powered by %{link}
diff --git a/config/locales/fi.yml b/config/locales/fi.yml
index 5f11bd3a..3705f972 100644
--- a/config/locales/fi.yml
+++ b/config/locales/fi.yml
@@ -638,7 +638,7 @@ fi:
   text_tip_issue_begin_day: tehtävä joka alkaa tänä päivänä
   text_tip_issue_end_day: tehtävä joka loppuu tänä päivänä
   text_tip_issue_begin_end_day: tehtävä joka alkaa ja loppuu tänä päivänä
-  text_project_identifier_info: 'Pienet kirjaimet (a-z), numerot ja viivat ovat sallittu.<br />Tallentamisen jälkeen tunnistetta ei voi muuttaa.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} merkkiä enintään."
   text_caracters_minimum: "Täytyy olla vähintään %{count} merkkiä pitkä."
   text_length_between: "Pituus välillä %{min} ja %{max} merkkiä."
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 4c76f050..01c172ab 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -847,7 +847,7 @@ fr:
   text_tip_issue_begin_day: tâche commençant ce jour
   text_tip_issue_end_day: tâche finissant ce jour
   text_tip_issue_begin_end_day: tâche commençant et finissant ce jour
-  text_project_identifier_info: 'Seuls les lettres minuscules (a-z), chiffres et tirets sont autorisés.<br />Un fois sauvegardé, l''identifiant ne pourra plus être modifié.'
+  text_project_identifier_info: 'Seuls les lettres minuscules (a-z), chiffres, tirets et tirets bas sont autorisés.<br />Un fois sauvegardé, l''identifiant ne pourra plus être modifié.'
   text_caracters_maximum: "%{count} caractères maximum."
   text_caracters_minimum: "%{count} caractères minimum."
   text_length_between: "Longueur comprise entre %{min} et %{max} caractères."
diff --git a/config/locales/gl.yml b/config/locales/gl.yml
index 543efcbb..51163c77 100644
--- a/config/locales/gl.yml
+++ b/config/locales/gl.yml
@@ -790,7 +790,7 @@ gl:
   text_min_max_length_info: 0 para ningunha restrición
   text_no_configuration_data: "Inda non se configuraron perfiles, nin tipos, estados e fluxo de traballo asociado a peticións. Recoméndase encarecidamente cargar a configuración por defecto. Unha vez cargada, poderá modificala."
   text_project_destroy_confirmation: ¿Estás seguro de querer eliminar o proxecto?
-  text_project_identifier_info: 'Letras minúsculas (a-z), números e signos de puntuación permitidos.<br />Unha vez gardado, o identificador non pode modificarse.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_reassign_time_entries: 'Reasignar as horas a esta petición:'
   text_regexp_info: ex. ^[A-Z0-9]+$
   text_repository_usernames_mapping: "Estableza a correspondencia entre os usuarios de Redmine e os presentes no log do repositorio.\nOs usuarios co mesmo nome ou correo en Redmine e no repositorio serán asociados automaticamente."
diff --git a/config/locales/he.yml b/config/locales/he.yml
index 0ae80526..01ac9366 100644
--- a/config/locales/he.yml
+++ b/config/locales/he.yml
@@ -857,7 +857,7 @@ he:
   text_tip_issue_begin_day: מטלה המתחילה היום
   text_tip_issue_end_day: מטלה המסתיימת היום
   text_tip_issue_begin_end_day: מטלה המתחילה ומסתיימת היום
-  text_project_identifier_info: 'אותיות לטיניות (a-z), מספרים ומקפים.<br />ברגע שנשמר, לא ניתן לשנות את המזהה.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "מקסימום %{count} תווים."
   text_caracters_minimum: "חייב להיות לפחות באורך של %{count} תווים."
   text_length_between: "אורך בין %{min} ל %{max} תווים."
diff --git a/config/locales/hr.yml b/config/locales/hr.yml
index 007b86b9..702db593 100644
--- a/config/locales/hr.yml
+++ b/config/locales/hr.yml
@@ -821,7 +821,7 @@ hr:
   text_tip_issue_begin_day: Zadaci koji počinju ovog dana
   text_tip_issue_end_day: zadaci koji se završavaju ovog dana
   text_tip_issue_begin_end_day: Zadaci koji počinju i završavaju se ovog dana
-  text_project_identifier_info: 'mala slova (a-z), brojevi i crtice su dozvoljeni.<br />Jednom snimljen identifikator se ne može mijenjati!'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "Najviše %{count} znakova."
   text_caracters_minimum: "Mora biti dugačko najmanje %{count} znakova."
   text_length_between: "Dužina izmedu %{min} i %{max} znakova."
diff --git a/config/locales/hu.yml b/config/locales/hu.yml
index f8bb0c8d..82159ad0 100644
--- a/config/locales/hu.yml
+++ b/config/locales/hu.yml
@@ -684,7 +684,7 @@
   text_tip_issue_begin_day: a feladat ezen a napon kezdődik
   text_tip_issue_end_day: a feladat ezen a napon ér véget
   text_tip_issue_begin_end_day: a feladat ezen a napon kezdődik és ér véget
-  text_project_identifier_info: 'Kis betűk (a-z), számok és kötőjel megengedett.<br />Mentés után az azonosítót megváltoztatni nem lehet.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "maximum %{count} karakter."
   text_caracters_minimum: "Legkevesebb %{count} karakter hosszúnek kell lennie."
   text_length_between: "Legalább %{min} és legfeljebb %{max} hosszú karakter."
diff --git a/config/locales/id.yml b/config/locales/id.yml
index 12e7eaa5..1587f40f 100644
--- a/config/locales/id.yml
+++ b/config/locales/id.yml
@@ -802,7 +802,7 @@ id:
   text_tip_issue_begin_day: tugas dimulai hari itu
   text_tip_issue_end_day: tugas berakhir hari itu
   text_tip_issue_begin_end_day: tugas dimulai dan berakhir hari itu
-  text_project_identifier_info: 'Yang diijinkan hanya huruf kecil (a-z), angka dan tanda minus.<br />Sekali disimpan, pengenal tidak bisa diubah.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "maximum %{count} karakter."
   text_caracters_minimum: "Setidaknya harus sepanjang %{count} karakter."
   text_length_between: "Panjang diantara %{min} dan %{max} karakter."
diff --git a/config/locales/it.yml b/config/locales/it.yml
index 9c616953..456eb830 100644
--- a/config/locales/it.yml
+++ b/config/locales/it.yml
@@ -576,7 +576,7 @@ it:
   text_tip_issue_begin_day: attività che iniziano in questa giornata
   text_tip_issue_end_day: attività che terminano in questa giornata
   text_tip_issue_begin_end_day: attività che iniziano e terminano in questa giornata
-  text_project_identifier_info: "Lettere minuscole (a-z), numeri e trattini permessi.<br />Una volta salvato, l'identificativo non può essere modificato."
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "massimo %{count} caratteri."
   text_length_between: "Lunghezza compresa tra %{min} e %{max} caratteri."
   text_tracker_no_workflow: Nessun workflow definito per questo tracker
diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index 10432431..d55c5167 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -886,7 +886,7 @@ ja:
   text_tip_issue_begin_day: この日に開始するタスク
   text_tip_issue_end_day: この日に終了するタスク
   text_tip_issue_begin_end_day: この日のうちに開始して終了するタスク
-  text_project_identifier_info: '英小文字(a-z)と数字とダッシュ(-)が使えます。<br />一度保存すると、識別子は変更できません。'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "最大%{count}文字です。"
   text_caracters_minimum: "最低%{count}文字の長さが必要です"
   text_length_between: "長さは%{min}から%{max}文字までです。"
diff --git a/config/locales/ko.yml b/config/locales/ko.yml
index cb64d10f..019f84ac 100644
--- a/config/locales/ko.yml
+++ b/config/locales/ko.yml
@@ -812,7 +812,7 @@ ko:
   text_tip_issue_begin_day: 오늘 시작하는 업무(task)
   text_tip_issue_end_day: 오늘 종료하는 업무(task)
   text_tip_issue_begin_end_day: 오늘 시작하고 종료하는 업무(task)
-  text_project_identifier_info: '영문 소문자(a-z) 및 숫자, 대쉬(-) 가능.<br />저장된후에는 식별자 변경 불가능.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "최대 %{count} 글자 가능"
   text_caracters_minimum: "최소한 %{count} 글자 이상이어야 합니다."
   text_length_between: "%{min} 에서 %{max} 글자"
diff --git a/config/locales/lt.yml b/config/locales/lt.yml
index 6b99c80c..56026ef4 100644
--- a/config/locales/lt.yml
+++ b/config/locales/lt.yml
@@ -854,7 +854,7 @@ lt:
   text_tip_issue_begin_day: užduotis, prasidedanti šią dieną
   text_tip_issue_end_day: užduotis, pasibaigianti šią dieną
   text_tip_issue_begin_end_day: užduotis, prasidedanti ir pasibaigianti šią dieną
-  text_project_identifier_info: 'Mažosios raidės (a-z), skaičiai ir brūkšniai galimi.<br/>Išsaugojus, identifikuotojas negali būti keičiamas.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} simbolių maksimumas."
   text_caracters_minimum: "Turi būti mažiausiai %{count} simbolių ilgio."
   text_length_between: "Ilgis tarp %{min} ir %{max} simbolių."
diff --git a/config/locales/lv.yml b/config/locales/lv.yml
index 5fdc8ecd..73320eec 100644
--- a/config/locales/lv.yml
+++ b/config/locales/lv.yml
@@ -822,7 +822,7 @@ lv:
   text_tip_issue_begin_day: uzdevums sākas šodien
   text_tip_issue_end_day: uzdevums beidzas šodien
   text_tip_issue_begin_end_day: uzdevums sākas un beidzas šodien
-  text_project_identifier_info: 'Tikai mazie burti (a-z), cipari un domuzīmes ir atļauti.<br />Kad saglabāts, identifikators nevar tikt mainīts.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} simboli maksimāli."
   text_caracters_minimum: "Jābūt vismaz %{count} simbolu garumā."
   text_length_between: "Garums starp %{min} un %{max} simboliem."
@@ -867,8 +867,8 @@ lv:
   default_role_manager: Menedžeris
   default_role_developer: Izstrādātājs
   default_role_reporter: Ziņotājs
-  default_role_non_member: Non member
-  default_role_anonymous: Anonymous
+  default_role_non_member: Non member
+  default_role_anonymous: Anonymous
   default_tracker_bug: Kļūda
   default_tracker_feature: Iezīme
   default_tracker_support: Atbalsts
@@ -933,4 +933,4 @@ lv:
   setting_commit_logtime_enabled: Enable time logging
   notice_gantt_chart_truncated: The chart was truncated because it exceeds the maximum number of items that can be displayed (%{max})
   setting_gantt_items_limit: Maximum number of items displayed on the gantt chart
-  text_powered_by: Powered by %{link}
+  text_powered_by: Powered by %{link}
diff --git a/config/locales/mk.yml b/config/locales/mk.yml
index 3dcdf120..0cbc914e 100644
--- a/config/locales/mk.yml
+++ b/config/locales/mk.yml
@@ -845,7 +845,7 @@ mk:
   text_tip_issue_begin_day: задачи што почнуваат овој ден
   text_tip_issue_end_day: задачи што завршуваат овој ден
   text_tip_issue_begin_end_day: задачи што почнуваат и завршуваат овој ден
-  text_project_identifier_info: 'Само мали букви (a-z), бројки и dashes се дозволени<br />По зачувувањето, идентификаторот неможе да се смени.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} знаци максимум."
   text_caracters_minimum: "Мора да е најмалку %{count} знаци долго."
   text_length_between: "Должина помеѓу %{min} и %{max} знаци."
@@ -892,8 +892,8 @@ mk:
   default_role_manager: Менаџер
   default_role_developer: Developer
   default_role_reporter: Reporter
-  default_role_non_member: Non member
-  default_role_anonymous: Anonymous
+  default_role_non_member: Non member
+  default_role_anonymous: Anonymous
   default_tracker_bug: Грешка
   default_tracker_feature: Функционалност
   default_tracker_support: Поддршка
@@ -938,4 +938,4 @@ mk:
   setting_commit_logtime_enabled: Enable time logging
   notice_gantt_chart_truncated: The chart was truncated because it exceeds the maximum number of items that can be displayed (%{max})
   setting_gantt_items_limit: Maximum number of items displayed on the gantt chart
-  text_powered_by: Powered by %{link}
+  text_powered_by: Powered by %{link}
diff --git a/config/locales/mn.yml b/config/locales/mn.yml
index b92c55eb..6bf504c5 100644
--- a/config/locales/mn.yml
+++ b/config/locales/mn.yml
@@ -827,7 +827,7 @@ mn:
   text_tip_issue_begin_day: энэ өдөр эхлэх ажил
   text_tip_issue_end_day: энэ өдөр дуусах ажил
   text_tip_issue_begin_end_day: энэ өдөр эхлээд мөн дуусч байгаа ажил
-  text_project_identifier_info: 'Зөвхөн жижиг үсгүүд болон (a-z), тоо and дундуур зураас ашиглаж болно.<br />Нэгэнт хадгалсан хойно, төслийн глобал нэрийг өөрлчөх боломжгүй.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "дээд тал нь %{count} үсэг."
   text_caracters_minimum: "Хамгийн багадаа ядаж %{count} тэмдэгт байх."
   text_length_between: "Урт нь багадаа %{min}, ихдээ %{max} тэмдэгт."
@@ -872,8 +872,8 @@ mn:
   default_role_manager: Менежер
   default_role_developer: Хөгжүүлэгч
   default_role_reporter: Мэдэгдэгч
-  default_role_non_member: Non member
-  default_role_anonymous: Anonymous
+  default_role_non_member: Non member
+  default_role_anonymous: Anonymous
   default_tracker_bug: Алдаа
   default_tracker_feature: Онцлог
   default_tracker_support: Тусламж
@@ -939,4 +939,4 @@ mn:
   setting_commit_logtime_enabled: Enable time logging
   notice_gantt_chart_truncated: The chart was truncated because it exceeds the maximum number of items that can be displayed (%{max})
   setting_gantt_items_limit: Maximum number of items displayed on the gantt chart
-  text_powered_by: Powered by %{link}
+  text_powered_by: Powered by %{link}
diff --git a/config/locales/nl.yml b/config/locales/nl.yml
index dd2036c2..389ddb2e 100644
--- a/config/locales/nl.yml
+++ b/config/locales/nl.yml
@@ -761,7 +761,7 @@ nl:
   text_no_configuration_data: "Rollen, trackers, issue statussen en workflows zijn nog niet geconfigureerd.\nHet is ten zeerste aangeraden om de standaard configuratie in te laden. U kunt deze aanpassen nadat deze is ingeladen."
   text_plugin_assets_writable: Plugin assets directory beschrijfbaar
   text_project_destroy_confirmation: Weet u zeker dat u dit project en alle gerelateerde gegevens wilt verwijderen?
-  text_project_identifier_info: 'kleine letters (a-z), cijfers en liggende streepjes toegestaan.<br />Eenmaal bewaard kan de identificatiecode niet meer worden gewijzigd.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_reassign_time_entries: 'Gerapporteerde uren opnieuw toewijzen:'
   text_regexp_info: bv. ^[A-Z0-9]+$
   text_repository_usernames_mapping: "Koppel de Redminegebruikers aan gebruikers in de repository log.\nGebruikers met dezelfde Redmine en repository gebruikersnaam of email worden automatisch gekoppeld."
diff --git a/config/locales/no.yml b/config/locales/no.yml
index c095a590..776dfe97 100644
--- a/config/locales/no.yml
+++ b/config/locales/no.yml
@@ -656,7 +656,7 @@
   text_tip_issue_begin_day: oppgaven starter denne dagen
   text_tip_issue_end_day: oppgaven avsluttes denne dagen
   text_tip_issue_begin_end_day: oppgaven starter og avsluttes denne dagen
-  text_project_identifier_info: 'Små bokstaver (a-z), nummer og bindestrek tillatt.<br />Identifikatoren kan ikke endres etter den er lagret.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} tegn maksimum."
   text_caracters_minimum: "Må være minst %{count} tegn langt."
   text_length_between: "Lengde mellom %{min} og %{max} tegn."
diff --git a/config/locales/pl.yml b/config/locales/pl.yml
index 6d596718..338eec7e 100644
--- a/config/locales/pl.yml
+++ b/config/locales/pl.yml
@@ -789,7 +789,7 @@ pl:
   text_min_max_length_info: 0 oznacza brak restrykcji
   text_no_configuration_data: "Role użytkowników, typy zagadnień, statusy zagadnień oraz przepływ pracy nie zostały jeszcze skonfigurowane.\nJest wysoce rekomendowane by załadować domyślną konfigurację. Po załadowaniu będzie możliwość edycji tych danych."
   text_project_destroy_confirmation: Jesteś pewien, że chcesz usunąć ten projekt i wszystkie powiązane dane?
-  text_project_identifier_info: 'Małe litery (a-z), liczby i myślniki dozwolone.<br />Raz zapisany, identyfikator nie może być zmieniony.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_reassign_time_entries: 'Przepnij przepracowany czas do tego zagadnienia:'
   text_regexp_info: np. ^[A-Z0-9]+$
   text_repository_usernames_mapping: "Wybierz lub uaktualnij przyporządkowanie użytkowników Redmine do użytkowników repozytorium.\nUżytkownicy z taką samą nazwą lub adresem email są przyporządkowani automatycznie."
diff --git a/config/locales/pt-BR.yml b/config/locales/pt-BR.yml
index d9e4f40e..5173b8fd 100644
--- a/config/locales/pt-BR.yml
+++ b/config/locales/pt-BR.yml
@@ -698,7 +698,7 @@ pt-BR:
   text_tip_issue_begin_day: tarefa inicia neste dia
   text_tip_issue_end_day: tarefa termina neste dia
   text_tip_issue_begin_end_day: tarefa inicia e termina neste dia
-  text_project_identifier_info: 'Letras minúsculas (a-z), números e hífens permitidos.<br />Uma vez salvo, o identificador não poderá ser alterado.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "máximo %{count} caracteres"
   text_caracters_minimum: "deve ter ao menos %{count} caracteres."
   text_length_between: "deve ter entre %{min} e %{max} caracteres."
diff --git a/config/locales/pt.yml b/config/locales/pt.yml
index 7b88bb79..d8474277 100644
--- a/config/locales/pt.yml
+++ b/config/locales/pt.yml
@@ -685,7 +685,7 @@ pt:
   text_tip_issue_begin_day: tarefa a começar neste dia
   text_tip_issue_end_day: tarefa a acabar neste dia
   text_tip_issue_begin_end_day: tarefa a começar e acabar neste dia
-  text_project_identifier_info: 'Apenas são permitidos letras minúsculas (a-z), números e hífens.<br />Uma vez guardado, o identificador não poderá ser alterado.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "máximo %{count} caracteres."
   text_caracters_minimum: "Deve ter pelo menos %{count} caracteres."
   text_length_between: "Deve ter entre %{min} e %{max} caracteres."
diff --git a/config/locales/ro.yml b/config/locales/ro.yml
index a5e90fab..5ace8afb 100644
--- a/config/locales/ro.yml
+++ b/config/locales/ro.yml
@@ -743,7 +743,7 @@ ro:
   text_tip_issue_begin_day: sarcină care începe în această zi
   text_tip_issue_end_day: sarcină care se termină în această zi
   text_tip_issue_begin_end_day: sarcină care începe și se termină în această zi
-  text_project_identifier_info: 'Sunt permise doar litere mici (a-z), numere și cratime.<br />Odată salvat, identificatorul nu mai poate fi modificat.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "maxim %{count} caractere."
   text_caracters_minimum: "Trebuie să fie minim %{count} caractere."
   text_length_between: "Lungime între %{min} și %{max} caractere."
diff --git a/config/locales/ru.yml b/config/locales/ru.yml
index 17ff25ff..e42b62f4 100644
--- a/config/locales/ru.yml
+++ b/config/locales/ru.yml
@@ -935,7 +935,7 @@ ru:
   text_no_configuration_data: "Роли, трекеры, статусы задач и оперативный план не были сконфигурированы.\nНастоятельно рекомендуется загрузить конфигурацию по-умолчанию. Вы сможете её изменить потом."
   text_plugin_assets_writable: Каталог для плагинов доступен по записи
   text_project_destroy_confirmation: Вы настаиваете на удалении данного проекта и всей относящейся к нему информации?
-  text_project_identifier_info: 'Допустимы строчные буквы (a-z), цифры и дефис.<br />Сохраненный идентификатор не может быть изменен.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_reassign_time_entries: 'Перенести зарегистрированное время на следующую задачу:'
   text_regexp_info: напр. ^[A-Z0-9]+$
   text_repository_usernames_mapping: "Выберите или обновите пользователя Redmine, связанного с найденными именами в журнале хранилища.\nПользователи с одинаковыми именами или email в Redmine и хранилище связываются автоматически."
diff --git a/config/locales/sk.yml b/config/locales/sk.yml
index 56f90560..55cb83bb 100644
--- a/config/locales/sk.yml
+++ b/config/locales/sk.yml
@@ -655,7 +655,7 @@ sk:
   text_tip_issue_begin_day: úloha začína v tento deň
   text_tip_issue_end_day: úloha končí v tento deň
   text_tip_issue_begin_end_day: úloha začína a končí v tento deň
-  text_project_identifier_info: 'Povolené znaky sú malé písmena (a-z), čísla a pomlčka.<br />Po uložení už nieje možné identifikátor zmeniť.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} znakov maximálne."
   text_caracters_minimum: "Musí byť aspoň %{count} znaky/ov dlhé."
   text_length_between: "Dĺžka medzi %{min} až %{max} znakmi."
diff --git a/config/locales/sl.yml b/config/locales/sl.yml
index 69e1ee5f..74fa1cae 100644
--- a/config/locales/sl.yml
+++ b/config/locales/sl.yml
@@ -731,7 +731,7 @@ sl:
   text_tip_issue_begin_day: naloga z začetkom na ta dan
   text_tip_issue_end_day: naloga z zaključkom na ta dan
   text_tip_issue_begin_end_day: naloga ki se začne in konča ta dan
-  text_project_identifier_info: 'Dovoljene so samo male črke (a-z), številke in vezaji.<br />Enkrat shranjen identifikator ne more biti spremenjen.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "največ %{count} znakov."
   text_caracters_minimum: "Mora biti vsaj dolg vsaj %{count} znakov."
   text_length_between: "Dolžina med %{min} in %{max} znakov."
diff --git a/config/locales/sr-YU.yml b/config/locales/sr-YU.yml
index 95a47e6a..59411b1f 100644
--- a/config/locales/sr-YU.yml
+++ b/config/locales/sr-YU.yml
@@ -842,7 +842,7 @@ sr-YU:
   text_tip_issue_begin_day: zadatak počinje ovog dana
   text_tip_issue_end_day: zadatak se završava ovog dana
   text_tip_issue_begin_end_day: zadatak počinje i završava ovog dana
-  text_project_identifier_info: 'Dozvoljena su samo mala slova (a-š), brojevi i crtice.<br />Jednom snimljen identifikator više se ne može promeniti.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "Najviše %{count} znak(ova)."
   text_caracters_minimum: "Broj znakova mora biti najmanje %{count}."
   text_length_between: "Broj znakova mora biti između %{min} i %{max}."
@@ -889,8 +889,8 @@ sr-YU:
   default_role_manager: Menadžer
   default_role_developer: Programer
   default_role_reporter: Izveštač
-  default_role_non_member: Non member
-  default_role_anonymous: Anonymous
+  default_role_non_member: Non member
+  default_role_anonymous: Anonymous
   default_tracker_bug: Greška
   default_tracker_feature: Funkcionalnost
   default_tracker_support: Podrška
@@ -938,4 +938,4 @@ sr-YU:
   setting_commit_logtime_enabled: Enable time logging
   notice_gantt_chart_truncated: The chart was truncated because it exceeds the maximum number of items that can be displayed (%{max})
   setting_gantt_items_limit: Maximum number of items displayed on the gantt chart
-  text_powered_by: Powered by %{link}
+  text_powered_by: Powered by %{link}
diff --git a/config/locales/sr.yml b/config/locales/sr.yml
index 0cc66c02..89b51a2a 100644
--- a/config/locales/sr.yml
+++ b/config/locales/sr.yml
@@ -842,7 +842,7 @@ sr:
   text_tip_issue_begin_day: задатак почиње овог дана
   text_tip_issue_end_day: задатак се завршава овог дана
   text_tip_issue_begin_end_day: задатак почиње и завршава овог дана
-  text_project_identifier_info: 'Дозвољена су само мала слова (a-ш), бројеви и цртице.<br />Једном снимљен идентификатор више се не може променити.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "Највише %{count} знак(ова)."
   text_caracters_minimum: "Број знакова мора бити најмање %{count}."
   text_length_between: "Број знакова мора бити између %{min} и %{max}."
diff --git a/config/locales/sv.yml b/config/locales/sv.yml
index 788293c3..f08f481c 100644
--- a/config/locales/sv.yml
+++ b/config/locales/sv.yml
@@ -906,7 +906,7 @@ sv:
   text_tip_issue_begin_day: ärende som börjar denna dag
   text_tip_issue_end_day: ärende som slutar denna dag
   text_tip_issue_begin_end_day: ärende som börjar och slutar denna dag
-  text_project_identifier_info: 'Små bokstäver (a-z), siffror och streck tillåtna.<br />När den är sparad kan identifieraren inte ändras.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "max %{count} tecken."
   text_caracters_minimum: "Måste vara minst %{count} tecken lång."
   text_length_between: "Längd mellan %{min} och %{max} tecken."
diff --git a/config/locales/th.yml b/config/locales/th.yml
index 8e27c60b..b46f7454 100644
--- a/config/locales/th.yml
+++ b/config/locales/th.yml
@@ -661,7 +661,7 @@ th:
   text_tip_issue_begin_day: งานที่เริ่มวันนี้
   text_tip_issue_end_day: งานที่จบวันนี้
   text_tip_issue_begin_end_day: งานที่เริ่มและจบวันนี้
-  text_project_identifier_info: 'ภาษาอังกฤษตัวเล็ก(a-z), ตัวเลข(0-9) และขีด (-) เท่านั้น.<br />เมื่อจัดเก็บแล้ว, ชื่อเฉพาะไม่สามารถเปลี่ยนแปลงได้'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "สูงสุด %{count} ตัวอักษร."
   text_caracters_minimum: "ต้องยาวอย่างน้อย %{count} ตัวอักษร."
   text_length_between: "ความยาวระหว่าง %{min} ถึง %{max} ตัวอักษร."
diff --git a/config/locales/tr.yml b/config/locales/tr.yml
index 0fbb684e..82d33792 100644
--- a/config/locales/tr.yml
+++ b/config/locales/tr.yml
@@ -682,7 +682,7 @@ tr:
   text_tip_issue_begin_day: Bugün başlayan görevler
   text_tip_issue_end_day: Bugün sona eren görevler
   text_tip_issue_begin_end_day: Bugün başlayan ve sona eren görevler
-  text_project_identifier_info: 'Küçük harfler (a-z), sayılar ve noktalar kabul edilir.<br />Bir kere kaydedildiğinde,tanımlayıcı değiştirilemez.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "En çok %{count} karakter."
   text_caracters_minimum: "En az %{count} karakter uzunluğunda olmalı."
   text_length_between: "%{min} ve %{max} karakterleri arasındaki uzunluk."
diff --git a/config/locales/uk.yml b/config/locales/uk.yml
index dfe3ffaa..aec46e55 100644
--- a/config/locales/uk.yml
+++ b/config/locales/uk.yml
@@ -603,7 +603,7 @@ uk:
   text_tip_issue_begin_day: день початку задачі
   text_tip_issue_end_day: день завершення задачі
   text_tip_issue_begin_end_day: початок задачі і закінчення цього дня
-  text_project_identifier_info: 'Рядкові букви (a-z), допустимі цифри і дефіс.<br />Збережений ідентифікатор не може бути змінений.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "%{count} символів(а) максимум."
   text_caracters_minimum: "Повинно мати якнайменше  %{count} символів(а) у довжину."
   text_length_between: "Довжина між %{min} і %{max} символів."
diff --git a/config/locales/vi.yml b/config/locales/vi.yml
index 8e5e111b..009296e6 100644
--- a/config/locales/vi.yml
+++ b/config/locales/vi.yml
@@ -730,7 +730,7 @@ vi:
   text_tip_issue_begin_day: ngày bắt đầu
   text_tip_issue_end_day: ngày kết thúc
   text_tip_issue_begin_end_day: bắt đầu và kết thúc cùng ngày
-  text_project_identifier_info: 'Chỉ cho phép chữ cái thường (a-z), con số và dấu gạch ngang.<br />Sau khi lưu, chỉ số ID không thể thay đổi.'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "Tối đa %{count} ký tự."
   text_caracters_minimum: "Phải gồm ít nhất %{count} ký tự."
   text_length_between: "Length between %{min} and %{max} characters."
diff --git a/config/locales/zh-TW.yml b/config/locales/zh-TW.yml
index 191c1b74..ae8dac27 100644
--- a/config/locales/zh-TW.yml
+++ b/config/locales/zh-TW.yml
@@ -946,7 +946,7 @@
   text_tip_issue_begin_day: 今天起始的工作
   text_tip_issue_end_day: 今天截止的的工作
   text_tip_issue_begin_end_day: 今天起始與截止的工作
-  text_project_identifier_info: '只允許小寫英文字母（a-z）、阿拉伯數字與連字符號（-）。<br />儲存後，代碼不可再被更改。'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "最多 %{count} 個字元."
   text_caracters_minimum: "長度必須大於 %{count} 個字元."
   text_length_between: "長度必須介於 %{min} 至 %{max} 個字元之間."
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index 73499925..0f2fda6d 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -837,7 +837,7 @@ zh:
   text_tip_issue_begin_day: 今天开始的任务
   text_tip_issue_end_day: 今天结束的任务
   text_tip_issue_begin_end_day: 今天开始并结束的任务
-  text_project_identifier_info: '只允许使用小写字母（a-z），数字和连字符（-）。<br />请注意，标识符保存后将不可修改。'
+  text_project_identifier_info: 'Only lower case letters (a-z), numbers, dashes and underscores are allowed.<br />Once saved, the identifier can not be changed.'
   text_caracters_maximum: "最多 %{count} 个字符。"
   text_caracters_minimum: "至少需要 %{count} 个字符。"
   text_length_between: "长度必须在 %{min} 到 %{max} 个字符之间。"
diff --git a/test/unit/project_test.rb b/test/unit/project_test.rb
index 8eb79fda..936008b0 100644
--- a/test/unit/project_test.rb
+++ b/test/unit/project_test.rb
@@ -101,6 +101,7 @@ class ProjectTest < ActiveSupport::TestCase
     to_test = {"abc" => true,
                "ab12" => true,
                "ab-12" => true,
+               "ab_12" => true,
                "12" => false,
                "new" => false}