Hi,
+1 for the Interface Language proposal.
For Content Language I like 2.1.1 and 2.2.1, with a preference for
2.2.1, since it scales better.
What I wonder is whether all users will make the distinction between
the Interface Language and Content Language. Below the title we could
elaborate a bit the text to provide more context from
"Available/Current language(s)" to "Available/Current language(s) for
this document / page".
It's true though that that content languages are displayed right below
the title in the 2.1 and 2.2 proposals so normally there shouldn't be
confusions, but it might be interesting to test with a few users
whether they can make the distinction.
Thanks,
Silvia