use gettext to handle translations

[Jibec]

as Fedora community member, I'll be pleased to host you on our translation platform it would make it faster for translators to contribute your project, and reduce the follow-up cost (people who want it will be notified when you update your pot file). You don't have to do anything else than:

• update the pot file when you do changes in your code
• add po files in your project before release

have a nice day, thank you for the fun :)