[wp-trac] [WordPress Trac] #30559: Plugins and themes translations aren't downloaded when language is changed

[WordPress Trac]

#30559: Plugins and themes translations aren't downloaded when language is changed
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 Reporter:  dimadin          |       Owner:
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Upgrade/Install  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by Chouby):

 In my experience, translations will be available at some point on a single
 site install. The fact that you need to click the "update translations"
 button is a bit inconsistent with core translations which are
 automatically downloaded but I guess we could live with this on a single
 site install.

 But it seems that on a multisite install, the plugins and themes
 translations are *never* downloaded. Thus the network admin is obliged to
 upload all translations manually. The patch proposed does not fix the
 issue.

 I believe that the problem is coming from the fact that the plugins and
 themes translations are downloaded through the update procedure while the
 core translations are explicitely downloaded with the function
 wp_download_language_pack().

 So far I circumvent the issue with this small plugin (network activated)
 {{{
 <?
 // Plugin name: Plugins & themes translation updates

 add_filter('themes_update_check_locales', 'pll_update_check_locales');
 add_filter('plugins_update_check_locales', 'pll_update_check_locales');

 function pll_update_check_locales($locales) {
         return get_available_languages();
 }
 }}}
 This still needs an action from the network admin but at least it's an
 easier process than the manual upload. Hope it helps waiting for a better
 core solution.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30559#comment:1>
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