In the Rails docs there seem to be different default locations for I18N strings, depending if the I18N-lookup was initiated from a view, model / validation, controller, helper, ..., if it's a label, etc...
How can I see where Rails is trying to lookup things by default, e.g. when I just use t('.something') ?
You can monkey patch the I18N backend in development mode to print out the I18n keys that are looked up in the backend.
Check here:
http://www.unixgods.org/Rails/where_is_Rails_trying_to_lookup_L10N_strings.html