Correct error message on group name #873

app/models/group.rb

@@ -48,4 +48,9 @@ class Group < Principal
                             :conditions => ["#{Member.table_name}.user_id = ? AND #{MemberRole.table_name}.inherited_from IN (?)", user.id, member.member_role_ids]).each(&:destroy)
     end
   end
+
+  def self.human_attribute_name(attribute_name)
+    attribute_name = "name" if attribute_name == "lastname"
+    super(attribute_name)
+  end
 end

test/unit/group_test.rb

@@ -16,11 +16,20 @@ require File.expand_path('../../test_helper', __FILE__)
 class GroupTest < ActiveSupport::TestCase
   fixtures :all
 
+  include Redmine::I18n
+
   def test_create
     g = Group.new(:lastname => 'New group')
     assert g.save
   end
 
+  def test_blank_name_error_message
+    set_language_if_valid 'en'
+    new_group = Group.new
+    assert !new_group.valid?
+    assert new_group.errors.full_messages.include? "Name can't be blank"
+  end
+
   def test_roles_given_to_new_user
     group = Group.find(11)
     user = User.find(9)