Use helper.
Use named route with attachment filename for inline images.
Adds a named route for thumbnails and use route helper in #thumbnail_tag.
Add named routes for attachments and use route helpers in #link_to_attachment.
Use route helper in #link_to_message.
Removed deprecated call from examples.
Use route helper in #link_to_project.
Add links to projects in Group projects list (#12843).
Traditional Chinese translation updated by ChunChang Lo (#12831)
use "UTF-16LE" instead of "UTF-16" on Ruby 1.9.2 due to test failure (#12787)
