All PhET channels are being marked as being in English, and other language/text issues

[jamalex]

The code is pretty messy, and would benefit from a refactor, but I'm guessing this line may be the culprit (or there are several other candidates, as English is hardcoded at the top, too): https://github.com/learningequality/sushi-chef-phet/blob/master/chef.py#L187

Some other related improvements:

• I'm guessing we can get language-specific descriptions from the PhET API or website, rather than hardcoding them here. Or at the very least, we should add more languages into the hardcoding -- most languages we support don't have them hardcoded in here at the moment.
• Channel names should not just be "channel PhET Interactive Simulations-". Why does it say "channel" at the beginning? Why do we use the English name ("Interactive Simulation")? And I think we're trying to move away from using langcodes in user-facing text.

[jamalex]

Ah, it looks as if most of those were made public but then subsequently deleted

So hopefully we're in the process of addressing those issues before reviving the channels.