Pascal Birchler 8a08cfc840 I18N: Use the user's locale when loading text domains in the admin.
Leverages `get_user_locale()` in `load_*_textdomain()` and `_load_textdomain_just_in_time()` to always load translations in the user's language when in the admin.

This re-introduces [39069], but now with additional tests and a `function_exists( 'wp_get_current_user' )` check in `get_user_locale()` in case it gets used early.

Props swissspidy, ocean90.
Fixes #38485.

git-svn-id: https://develop.svn.wordpress.org/trunk@39127 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-03 20:07:08 +00:00
2016-09-06 18:12:09 +00:00
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