Dominik Schilling (ocean90) 5259f34578 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.

git-svn-id: https://develop.svn.wordpress.org/trunk@37635 602fd350-edb4-49c9-b593-d223f7449a82
2016-06-05 12:21:38 +00:00
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