[wp-trac] [WordPress Trac] #15677: It is not possible to install multiple variants of the same language

[WordPress Trac]

#15677: It is not possible to install multiple variants of the same language
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 Reporter:  caesarsgrunt  |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  4.0
Component:  I18N          |     Version:  3.1
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by pavelevap):

 ocean90: OK, thank you. But what about older installations (updated from
 3.9.x)? All will have WPLANG defined and they could switch language to
 English original (and back). There should be any Help tooltip available or
 en_US option unavailable for them.

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Ticket URL: <https://core.trac.wordpress.org/ticket/15677#comment:21>
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