[openstreetmap/openstreetmap-website] Add language dropdown menu (#2581)

[kjonosm]

I read this issue being different from #1115 as it seems to not ask for a language switcher on the homepage also for non-logged in users but (only) for a dropdown menu within the preferences panel instead of a free text field to help choosing the preferred language. Just like it's already implemented for choosing the preferred editor.

<img width="964" alt="Bildschirmfoto 2022-09-07 um 10 12 31" src="https://user-images.githubusercontent.com/51236777/188829207-63e7ae7f-5419-43d6-88e6-324bafb3d68f.png">

I support this request because the chosen language is not only used for the website but for the iD editor, as well.

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