Add i18n base file for Weblate
Created by: LNJ2
This adds an empty translation file for creating new translations from the Weblate WebUI. This won't work fully automated, we will still have to add it to the QMake and QRC file, so that it'll work correctly with new languages, but the we could probably grow the number of translators, because not everyone wants to open an issue on GitHub just to do some translations.