[wp-trac] [WordPress Trac] #29860: Remove theme/plugin translations when deleting a theme/plugin

[WordPress Trac]

#29860: Remove theme/plugin translations when deleting a theme/plugin
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 Reporter:  ocean90       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.1
Component:  I18N          |    Version:
 Severity:  normal        |   Keywords:  has-patch
  Focuses:                |
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 When deleting a theme or a plugin the translation files remain in
 WP_LANG_DIR, when they were installed via the new Translation API
 (language packs). We should remove them too.

 Too keep it simple I attached a patch which doesn't introduce any new API.

 I changed `wp_get_installed_translations()` to return only translations
 which also have a .mo file since just a .po file isn't enough.

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Ticket URL: <https://core.trac.wordpress.org/ticket/29860>
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