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