New strings to localization (#5225)

* error_can_not_delete_custom_field: Unable to delete custom field
* error_unable_to_connect: Unable to connect ({{value}})
* error_can_not_remove_role: This role is in use and can not be deleted.
* error_can_not_delete_tracker: This tracker contains issues and can't be deleted.


git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3627 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/auth_sources_controller.rb

@@ -63,7 +63,7 @@ class AuthSourcesController < ApplicationController
       @auth_method.test_connection
       flash[:notice] = l(:notice_successful_connection)
     rescue => text
-      flash[:error] = "Unable to connect (#{text})"
+      flash[:error] = l(:error_unable_to_connect, text.message)
     end
     redirect_to :action => 'index'
   end