As of Id345e933, we fire the language change hook when the user switches language by clicking on a link in the languages list. In order to compare the user switching language in the scenario above with the user switching language via the CLS and/or Vector's language switcher, ensure that we fire language change hook in all treatments. Bug: T280770 Change-Id: I4a74254612557c287b16f4f086077a2637de9a2e