Revert r55800 "bug 19646 Localization of img_auth.php - with enhancements"

Revert r55800 "bug 19646 Localization of img_auth.php - with enhancements"
The localization code here is really ugly with weird things like call_user_func_array() all over the place, and there are bugs with escaping for log entries and such.

Tried to rebuild all the localization files, but rebuildLanguage.php doesn't seem to consider the messages as "unknown". Have removed from English and qqq.