Switch lang-picker-toggler to a button

[XhmikosR]

Should be better for accessibility and we will probably simplify a few things.

I'll take a stab at it in the next days.

[moshfeu]

If you already touch it, it will be better to add more accessibility aspects to the list (options also should be focusable, aria-expanded, aria-haspopup etc.)

[XhmikosR]

See #2566

Only toggling aria-expanded is left.

[moshfeu]

🔥
I'm not familiar with that syntax but I can't see how the options will be focusable (navigate via tabs, or even arrows)

[XhmikosR]

That doesn't work, unfortunately. Nor the toggler closes with the Esc key. But you are more than welcome to help me out in that PR :)

[moshfeu]

Ok.
I'll see what I can do :)