Advanced note maneuvers

[kiriDevs]

There are a few common notes we could automatically translate into English, if the user's language is English.

@ChuangSheep maybe we could also do that on an API-level, to not have to make those notes public.

Also, when a note reads "ebenso!" for the second part of a double lesson, we could automatically replace that with the note from the first half of the double lesson.

The first thing probably makes sense on both UIs, but the second one probably only on mobileui, since otherwise you'd have to expand the other period to read the note.

[ChuangSheep]

Why do we even need engl. translation though....

[kiriDevs]

Why do we even need engl. translation though....

We don't necessarily need it, but I think it'd be neat if the rest of the interface is also English - especially on mobileui, which generates sentences for who substitutes who right above the note, since you have a German sentence right above an English one.