Language names are not translated

In the current version the list of languages is not translated. They probably should be.

There are 3 issues to tackle here:
1. Language names must be translated (Spanish should be español, etc.). People don;t recognize their own language expressed in English.
2. "Translate to" should be in the browser language.
3. The default language offered in the language pulldown should be the browser language.

Proposed implementation:

1. Just get a static list of language name translations, keyed by langcode into the js. (These can be obtained via the translate service I imagine; there might be other ways.)
2. Get a static list of "Translate to:" in there also. Same exact implementations. Might be in the same array.
3. Use those lists for presentation based on the current browser language.
4. Make sure that each select is presented in the current browser language (defaulting with the key from the current browser language).