Add qa_enforce_locale_to_en for preferred_language
Related issue: #2318 (closed)
What does this MR do and why?
Add qa_enforce_locale_to_en
for User#preferred_language
.
- When FF enabled,
preferred_language
of newly registered users is alwaysen
; - When FF disabled (default),
preferred_language
of newly registered users is set through::Gitlab::CurrentSettings.default_preferred_language
;
/cc QA @WilsonDuan
/cc EM @prajnamas