How to see a game language

Check if you have the option to access the game settings and try to look for the game language.

Or check with the game developer to see if they can provide you a link that contains the game guide how to change the language settings.

Or re-install the game

Honestly seeing how the game is rated M I think it is stupid to issue punishment for language but we all agreed to the same ToU and CoC that xbox had us agree to when our accounts were made. It's sad to see that the mature players cannot use language but
seeing how a good 30-40% of the cod players are kids I understand where they are coming from but then again the parents should not be letting their kids play a rated M game.

Yeah, but the language that is download is usually what the publisher's send out for specific regions. The language settings on the console only affect the language you see on the dashboard, not the language in games. That would be why you download games
with different languages sometimes.

Hello Howard Buss how are you?
My name is Ezequiel I'm an Independent Consultant and I'm happy to help you today. To change the language of the game it's very easy you need to go to the options, then go to general, then enter the misc option, and finally you will see the first option which is the language where you can change the language.

From the R* support forum:

Question: How can I change my language in GTA V?

Answer: The language in GTA V depends on your console language setting. If your console language is not supported in GTA V you will be prompted to select a language when starting the game. If you would like to reset the language after the game has already
saved it:

On Xbox 360: Hold LB + RB while booting the game

support.rockstargames.com/.../200195177-How-to-change-the-language-in-Grand-Theft-Auto-V