Translate the App (i18n)

[maltfield]

This ticket will track the effort to add internationalization (i18n) to the BusKill app such that things like the "arm" button, tooltips, labels in the navigation drawer, settings/options names/descriptions are automatically changed to the system's locale or whatever language is defined in the BusKill settings.

IMHO, it's not so important to provide translations to our documentation, which can trivially be translated by the user with tools like Google Translate. The text in the app, however, can't just be copied & pasted into a translator. So i18n of the app takes priority over i18n of the docs.

[maltfield]

After English, I think the most-common langauge of our users is German. I welcome translations to any language that users want to contribute, but here's a list of languages in-order of mother tongue of most of our users to less of our users:

1. English
2. German
3. Dutch
4. Spanish
5. French
6. Japanese
7. Czech
8. Arabic
9. Russian
10. Chinese (Mandarin?)
11. Portuguese
12. Finnish
13. Swedish
14. Norwegian
15. Korean
16. Romanian
17. Turkish
18. Thai
19. Greek
20. Italian
21. Polish
22. Hungarian
23. Indonesian
24. Slovak
25. Serbian
26. Croatian
27. Mongolian
28. Lithuanian

Therefore, I think

1. The first deliverable of this ticket would be to modify the app to actually support i18n through some sort of abstraction (using .po files or whatever is the "pythonic" approach here) to only English and German. After that, I think
2. The next deliverable is to setup some sort of automated machine translation to all the other languages above (they can be refined later by a human, but machine translation is better than nothing). Ideally this would just be some script that takes the English strings and a set of destination languages and spits-out new translated strings for the given destination languages.

[maltfield]

I'm actually wondering if it makes more sense to just automate translations at CI time

TODO: look into using apertium (or similar) for offline translations at build-time