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Delete common/l10n.js.

Description

Delete common/l10n.js.

It held resource strings when introduced by rP16127, but those were moved to json files in rP18964. rP19771 moved two trivial functions of this file to tooltips.js.
Remove a wrong comma from the JSdoc comment.
Alwas return a string.

Differential Revision: https://code.wildfiregames.com/D618
Confirmed by Itms in a forum PM that this doesn't break string freeze.