Add place name quest (fixes #309, unblocks #1354)

[westnordost]

Still todo:

• see if it is possible to somehow replace those escaped unicode characters in the localizations with normal characters (as the JSONs are already UTF-8)
• update readme etc. to link the osmnames repository
• update readme etc. to mention where the translation data is from (and how to contribute / report bugs)

[rugk]

Hint: GitHub does not link/care about issue/PR numbers linked in the title of PRs (or issues, for what it's worth).

Edit: Actually, it (also) fixes #22.

[HolgerJeromin]

You are right with linking. Closing should work

fixes #309, unblocks #1354

[rugk]

Sorry for doing this off-topic discussion, but yeah, not even closing works, actually. It only works if/because the same is mentioned in the commit. However, in this case here (where the commit message is different) even that does not work.