Dominik Schilling d8357b76c5 Upgrader: Don't use Language_Pack_Upgrader_Skin::before() and Language_Pack_Upgrader_Skin::after() when translations are up to date.
Avoids a PHP notice since `Language_Pack_Upgrader_Skin::before()` tries to access a non-existent update.
Also, change the `up_to_date` string to use the plural form because translations are only updated in bulk mode.

Fixes #36615.
Built from https://develop.svn.wordpress.org/trunk@37635


git-svn-id: http://core.svn.wordpress.org/trunk@37603 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-06-05 12:22:30 +00:00
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2016-03-10 05:37:27 +00:00