Dropdown language selector menu shifts on scroll

[okplanbo]

Hi everyone.

The dropdown menu shifts to the left if it is opened and if the page is being scrolled.

Functional, but a bit annoying.

[eric-burel]

On it, this is FF specific (edit: actually no I can repro on Chrome also, when the screen is smaller in height than the menu I think, will dig).

What happens is that the "x-placement" attribute changes while we scroll. I think the dropdown notices that it should open in a different direction depending on how much we scroll. It could be disabled here.

Also should be in dark mode.

Update: the bug is not in our own code, see react-bootstrap/react-bootstrap#6715
I've however set it to dark version so it doesn't flash people.