Hi. I sit for Joomla "Russial" as default language in frontend & backend.
But SuperUser has settings in profile: "Backend Language: English" (because I prefer English in backend).
Problem: When SuperUser reSend Activation for registered user, this user will get email in English.
If SuperUser set "Backend Language: Russian", registered user will get email in Russian.
I suggest email language to based on global site language settings (or user's language settings): in both cases Russian for me.
Thanks.