Core class used for updating/installing language packs (translations) for plugins, themes, and core.

Asynchronously upgrades language packs after other upgrades have been made.

Bulk upgrade language packs.

Checks that the package source contains .mo and .po files.

Clears existing translations where this item is going to be installed into.

Get the name of an item being updated.

Upgrade a language pack.

Initialize the upgrade strings.

Filters whether to asynchronously update translation for core, a plugin, or a theme.