Update German, Spanish, French, Japanese and Turkish translations
Mention domain name in DNS error (bug #1090852)
Show error message when uploading unsupported formats (bug #1089372)
Add user instructions to the crop page
Add support for GIF files (bug #1089372)
Hide usernames from the UI

OpenID and BrowserID usernames are already pretty useless since
they are automatically assigned. Hiding all usernames will lessen
the need to let users choose their own (bug #859456).
Add Christian Weiske to humans.txt
New strings to translate
Update copyright years
Bump changelog for deployment