Localization lost in GtkBuilder interface file when using XFCE_LICENSE_*

[Ali Abdallah]

Hi all,

Reported by Hashimoto against Parole, but i just realize that other 
packages are affected too (Terminal for example).

Steps:
1) Set locale to let's say fr_FR.utf8
2) Open Terminal or Parole...
3) Open the about dialog
4) Reopen the preferences dialog (or any dialog constructed by 
GtkBuilder in the application).

Result:
Strings are displayed in English.

It took me a lot of time to figure out that the thing is XFCE_LICENSE_* 
is calling xfce_textdomain (GETTEXT_PACKAGE, PACKAGE_LOCALE_DIR, NULL); 
but for some reason it is messing up with locale domain of the package 
itself.

Disabling the call in libxfce4util or calling xfce_textdomain 
(GETTEXT_PACKAGE, LOCALEDIR, "UTF-8"); again after closing the dialog 
fixes the problem, no idea why.

Please your comments.

Ali.