Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  afa7a426f46eb5ec562724ae4b12558552759de2
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Translation web services refactoring

Needed for translation aids api. Note that old code is kept in
utils/TranslationHelpers.php - it will be cleaned up later.

Change-Id: I683d26170ed64fb70effbf4b03764646a313cf3d