DeltaChat (mostly) working on Librem5

Today, I managed to get DeltaChat working on the Librem5,
I had to use the Compositor option in the Mobile Settings app to get it to scale properly, but it looks really presentable.
Hopefully I can put it to good use.

One weird thing though: depending on which layout I choose in Squeekboard certain letters do not work. I hit the key and nothing happens.
In one layout it is the ‘s’, in another it is the ‘j’. I haven’t discovered a pattern just yet. It is the only app that does this.
On my MS Surface running Linux I haven’t noticed any such problems.