So Here is what it give / how it would work:
My thinking with Drow and Elves not being able to select the other language at start, is a way to prevent people cheese-balling subterfuge and spying RP, and having to actually learn the language and get the books. (course one is more available then the other...)Select 1 Bonus Language.
Does not count against your learn-able languages.
Available Languages:
Elven
Xanalress
Dwarven
Gnomish
Hinnish
Orcish
Goblin
Undercommon
Celestial
Infernal
Abyssal
Draconic
Jotun
Possible Restricted Languages:
Elven (Drow Cannot Select)
Xanalress (Elves Cannot Select)
Cannot Be Learned:
Sign Language
Thieves Cant
Debatable / Up to the Devs:
Animal Language (Mainly because Sylvin is also part of this, and is taught in other parts of the world)
Note: A Language will also be unavailable if they already have it by race / where given to them by a class.
I thought about suggesting the same with Aasamir and Teiflings, but their a 5% right now, so no real point, let them have their cake, plus Celestal, Infernal, and Abyssal are often taught by clergy, and magical study in schools, so that is was another point against restricting them in my mind.