[wp-trac] [WordPress Trac] #47547: switch_to_locale( 'en_US' ) is unreliable

[WordPress Trac]

#47547: switch_to_locale( 'en_US' ) is unreliable
----------------------------+-----------------------------
 Reporter:  johnbillion     |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  I18N            |    Version:
 Severity:  normal          |   Keywords:  needs-patch
  Focuses:  administration  |
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 Given a site that uses `en_US` as its language, a user with their user
 language set to something else, and that user logged into the admin
 dashboard, calling `switch_to_locale( 'en_US' )` appears to be unreliable.

 1. ❌ The return value of `determine_locale()` is the user's language, not
 `en_US`.
 2. ✅ Localised text without a textdomain (ie. text from core) is
 correctly displayed in `en_US`.
 3. ❌ Localised text with a textdomain (ie. text from plugins or themes)
 is incorrectly displayed in the user's language. This may be related to
 #39210.

 Given a site that itself uses a language other than `en_US`, calling
 `switch_to_locale( 'en_US' )` does appear to work although I haven't
 tested it extensively.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47547>
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