Adds confirmation message to changeset/issue relation delete link.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8884 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/repositories/_related_issues.html.erb

@@ -16,6 +16,7 @@
                 :id => @project, :repository_id => @repository.identifier_param,
                 :rev => @changeset.identifier, :issue_id => issue},
        :method => :delete,
+       :confirm => l(:text_are_you_sure),
       }, :title => l(:label_relation_delete)) if manage_allowed %>
 
   </li>