In "Choose Preferred Application" dialog, a message "Please choose your preferred Web\n Browser now and click OK to proceed." is not localized, English strings are still displayed. I confirmed it on LANG=ja and ja translation is completed in ja.po. Build & Platform: Build 2009-04-08 on Arch Linux.
You're right. Fixed in revision 29730: * exo-helper/exo-helper-launcher-dialog.c: Add gettext() call around two strings which are already as translatable with N_() (bug #5203).