Hi Hogkammen,
Thanks for taking the time to post these glitches.
All of these things are related. The icon you’ve asked about is for toggling on/off the menu of installed languages that are available to the client to choose from.

The problem is that if no languages are enabled, it messes up the layout… which is what you are seeing
I am working on a fix for this and it will be included in the next update (v1.2), sometime next week.
In the meanwhile a simple fix for you would be to go to Staff > Admin Panel > System > Secondary Languages and enable one or more extra languages.