[Feature] Change from country names to sign language names

[AmitMY]

Problem

The sign language selector is a language selector.

It turns out to be a little confusing, especially for cases like "swiss german" or "swiss french" where one has to select the same country but a different language.

Description

Proposal:

• [x] Use the actual sign language ISO codes. Say "American", "Israeli", "Swiss-German" etc...
  • [x] This requires translating sign language names in 100+ languages (Google Translate)
  • [ ] For short names, a manual pass should be used to remove the "Sign Language" suffix/prefix in every language
• [x] Show country flag based on language code
• [x] Send the actual sign language code to the API

Maybe later:

• [ ] Consider every non-natural language pair (for example, Hebrew, and American Sign Language) as such. When translating between non-natural pairs, we can introduce a spoken-language-machine-translation step in the middle

Alternatives

No response

Additional context

No response

[AmitMY]

Moved the remaining translation step to the i18n repo https://github.com/sign/i18n/issues/4