[openstreetmap/openstreetmap-website] Increase may key and value max length (#2025)

[mmd]

Hmm... API 0.6 has no way to convey an out-of-band information about tag values having more than 255 characters. So whatever schema you use to abbreviate long strings, you still don't know if the server holds more than 255 characters or some user is only playing some funny tricks by adding their own abbreviation characters.

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