…is not

yet saved in the settings storage. I also started the translation process,
by removing hardcoded strings and replacing them with keys, so they are
found in the JSON files.
And lastly added a new menu entry, which looks really messy, but changing
the language works.

…tance

directly in the class, it is passed in as parameter (DI), so I could test
the class properly.
Furthermore I have added a new method in the Settings class to get the
setting via a method call, instead of relying on magic functions.
I have also added a fallback language (en_US), which can be modified in the
constants.py file, to load these language strings if no translation can be
found in the current language file.

…ete.

…slation.

I may have added some additional whitespaces in the used data structures.
But I think that is not such a huge problem.