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not mandatory to refactor, since we always run the languagesmanager.test.php before release, so having all cleanup code in there is good enough I think
There are differences in the output when each saves the translations to a file. It makes sense to make these uniform through a single writer, to minimize diffs.
(In ) fixes #2229, refs #5591 - TranslationWriter contains refactored saveTranslation code; also added unit tests