[wp-trac] [WordPress Trac] #59985: Language "German (Austria)" outputs html lang incorrectly as "de-DE" not "de-AT"

[WordPress Trac]

#59985: Language "German (Austria)" outputs html lang incorrectly as "de-DE" not
"de-AT"
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 Reporter:  crascher      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  I18N          |    Version:  6.4
 Severity:  major         |   Keywords:
  Focuses:                |
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 Hi, the problem seems to be old or to be back since some time.

 The lang attribute in the html tag for the language/translation "German
 (Austria)" is incorrectly output as "de-DE". This would be correct for
 plain German, but for the region of Austria it should be "de-AT".

 See also here: https://core.trac.wordpress.org/ticket/55412

 This is quite a problem for us because we have different pages in Germany
 and Austria. To have for both pages de-DE is impacting our SEO setup.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59985>
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