In *.wikipedia.org's Preferences
Internationalisation Language:
should also (optionally) affect the language used when sending
"A page on your watchlist has been changed"
emails.
In *.wikipedia.org's Preferences
Internationalisation Language:
should also (optionally) affect the language used when sending
"A page on your watchlist has been changed"
emails.
This is unrelated to the watchlist but about MediaWiki's enotif emails. For future reference, please use and fill out the templates linked from the preamble headers.