Update language attribute restrictions in API #1193
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As far as I read the current implementation, the software technically processes hyphened language tags and does legally emit ISO 639-3 as well as ISO 639-1 codes. That means even though Mastodon itself is not ready to support the most of advanced language tags, it has no problem inputting/outputting those codes in API. Thus we can:
mastodon/mastodon#19302 is a corroboration that a language tag doesn't break the system.
The rationale of this change is discussed in mastodon/mastodon#23541.
Closes mastodon/mastodon#23541.