We should push to adopt a standard iconography for "language/region menu/options". A good candidate may be a world icon (which some companies already use, e.g.: dell.com).

Once there, given that the language list itself is in its own localization (or that iso codes are used to represent them, or both) you should be able to pick yours just fine.

More problematically, in a character set you don't know!

Iconography is required.