http://developer.gnome.org/glib/stable/glib-I18N.html#N-:CAPS states that gettext should be called at runtime and it doesn't seem to be the case. The relevant code is the following (from src/frogr-auth-dialog.c line 164):

label = gtk_label_new (auth_txt);

Actually I don't understand why you use that auth_txt variable. Couldn't we just remove it altogether and chang the label creation line to the following?

label = gtk_label_new (_("Enter verification code:"));

Created attachment 231806 [details] [review]
Fix missing gettext call

The auth_txt string was displayed in the C locale regardless of the user's locale.
Also get rid of the useless variables and have the strings directly in the fonction calls.

Review of attachment 231806 [details] [review]:

(In reply to comment #3)
> Created an attachment (id=231806) [details] [review]
> Fix missing gettext call
> 
> The auth_txt string was displayed in the C locale regardless of the user's
> locale.
> Also get rid of the useless variables and have the strings directly in the
> fonction calls.

Thanks for your patch. Actually I don't understand either why I was using those variables at all. Perhaps they were useful in some way some time ago but they are definitely useless right now. 

Please feel free to commit the patch when possible.

Attachment 231806 [details] pushed as 6f901ed - Fix missing gettext call