[wp-trac] [WordPress Trac] #42577: TinyMCE in Wordpress 4.9 does not work with de_DE_formal Locale

[WordPress Trac]

#42577: TinyMCE in Wordpress 4.9 does not work with de_DE_formal Locale
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 Reporter:  osti47        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  TinyMCE       |    Version:  4.9
 Severity:  normal        |   Keywords:
  Focuses:                |
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 wenn WordPress language is set to "de_DE_formal (Deutsch SIE)" the TinyMCE
 toolbar in post, pages and simlar editors does not display. Javasscript
 console complains about "Language code must have format 2-3 letters and.
 optionally, hyphen, underscore followed by 2 more letters"

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Ticket URL: <https://core.trac.wordpress.org/ticket/42577>
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