[wp-trac] [WordPress Trac] #42582: Error with WP 4.9 and German (Formal) translation

[WordPress Trac]

#42582: Error with WP 4.9 and German (Formal) translation
--------------------------+-----------------------------
 Reporter:  Metasequoia   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  I18N          |    Version:  4.9
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 After updating to WP 4.9 I see this errors in the console:


 {{{
 Uncaught TypeError: Language code must have format 2-3 letters and.
 optionally, hyphen, underscore followed by 2 more letters

 mediaelement-migrate.min.js?ver=4.9:1 Uncaught ReferenceError:
 MediaElementPlayer is not defined

 }}}

 My site has the '''german (formal)''' translation installed.

 The effect of this error is a non working Media page and errors in the
 posts and pages editor.

 Please have a look at this bug and fix it soon. Thanks!

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Ticket URL: <https://core.trac.wordpress.org/ticket/42582>
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