Add more languages

[coderkun]

The application is prepared for localization but currently provides only German translation. Add more languages (at least English).

[gabrielssilva]

I will send a PR for Brazilian Portuguese translations (as soon as I get gettext to work).

Btw, is an en-us .po file necessary? I mean, the default messages are in english, so the application should also be in english if the de_DE locale is not active.

[gabrielssilva]

PR for pt_BR: #15

[coderkun]

Hey @gabrielssilva, thanks a lot for your PR. I will check it out and merge it in the next days.

I think an en_US or en in general is necessary because the keys—that are mostly in English, that’s right—do not represent a good language and would be translated a bit different, even in English. I started this some months ago and will finish and upload it eventually.

[coderkun]

Translation for EN added with 6c8abc3.

@gabrielssilva, please review your pt_BR translation based on the English translation (if necessary at all). I will then compile the PO into an MO file.