Dominik Schilling (ocean90) 4052571ed7 I18N: Enable clear_destination in upgrader for updating/installing language packs.
Introduces `Language_Pack_Upgrader::clear_destination()` to clear existing translations before installing new translations. Ensures that unused translations in JSON format are cleaned up.

Props dd32, swissspidy, ocean90.
Fixes #45468.

git-svn-id: https://develop.svn.wordpress.org/trunk@44676 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-21 21:12:23 +00:00
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