[wp-trac] [WordPress Trac] #38590: Don't use `get_available_languages()` in `_load_textdomain_just_in_time()`

[WordPress Trac]

#38590: Don't use `get_available_languages()` in `_load_textdomain_just_in_time()`
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 Reporter:  ocean90       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Future Release
Component:  I18N          |    Version:  4.6
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 `get_available_languages()` has been introduced in #11774 and is only
 designed to work with translations for core IMO.

 Since [37415] it's also used to retrieve translations in the plugin/theme
 directory of `WP_LANG_DIR`.

 `get_available_languages()` does three `strpos()` checks to prevent
 returning language codes like `admin-zh_TW`, `continents-cities-zh_TW` or
 `ms-zh_TW`.
 Using `get_available_languages()` for plugins/themes will not return
 language codes (see `@return` tag). It returns the text domain and the
 language code of a file. But only if a plugin/theme doesn't start with
 `admin-` or `ms-`.

 Instead of using `get_available_languages()` in
 `_load_textdomain_just_in_time()` a direct call to `glob()` should be
 sufficient.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38590>
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