This problem only exists in Main page.
Steps to Reproduce:
- set Preference -> Internationalisation -> Language (lang) to zh-Hans at Chinese Wikiquote, Wiktionary, Wikinews, Wikisource, Wikiversity and Wikibooks (sites)
- go the main page of sites
- set lang to zh-Hant at sites
- back again to the main page, with a purge
Actual Results: The site name in <title> doesn't vary based on lang
Expected Results: It varies, like the effect shown at Chinese Wikipedia