[wp-trac] [WordPress Trac] #38788: Make get_available_languages() filtrable

[WordPress Trac]

#38788: Make get_available_languages() filtrable
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 Reporter:  yoavf        |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  I18N         |    Version:  trunk
 Severity:  normal       |   Keywords:  has-patch
  Focuses:               |
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 When a user object is saved (i.e, after editing the user settings) WP will
 discard (and replace with `en_US`) any value for the new user `locale`
 meta if it is not part of the array returned by
 `get_available_languages()`

 `get_available_languages()` works by scanning the language folder for
 `.mo` files. In some use cases, language files might not exist for a
 locale, named in a different way, or maybe stored elsewhere.
 `get_available_languages()` results should be filtrable.

 FWIW: we need this filter (or an alternate solution) to merge the new user
 locale setting and locale switching to WP.com.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38788>
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