[wp-trac] [WordPress Trac] #45528: Editor JSON translations fail to load if WP_CONTENT_DIR been redefined

[WordPress Trac]

#45528: Editor JSON translations fail to load if WP_CONTENT_DIR been redefined
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 Reporter:  fierevere     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  I18N          |    Version:  5.0
 Severity:  major         |   Keywords:  has-screenshots
  Focuses:                |
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 Translation for Gutenberg editor screen is partial when WP_CONTENT_DIR
 been redefined. JSON translations are present in WP_CONTENT_DIR/languages
 but are not used.

 Steps to reproduce (fresh WP install):
 https://codex.wordpress.org/Giving_WordPress_Its_Own_Directory
 1. install localized wordpress in subfolder (
 http://localhost:8080/wordpress in my case )
 2. move installation to root of domain
 create index.php, redefine siteurl
 3. define new constants
 define( 'WP_CONTENT_DIR', '/siteroot/wp/wp-content' );
 define( 'WP_CONTENT_URL', 'http://localhost:8080/wp-content' );
 define( 'WP_PLUGIN_DIR', '/siteroot/wp/wp-content/plugins' );
 define( 'WP_PLUGIN_URL', 'http://localhost:8080/wp-content/plugins' );
 4. ensure everything is working. (It is!)
 Try to load editor, (new post/page) - localization is broken.

 Expected: geditor-good.jpg
 Got: geditor-bad.jpg

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Ticket URL: <https://core.trac.wordpress.org/ticket/45528>
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