Titan's voice can be changed and language for them eihter?

Titanfall 2 has some language and region limitations. So if you bought the game in one of those locked countries, you won't be able to change your game language.

To change the language on the PC version of Titanfall 2 right-click the game from within Origin and select Game Properties -> Advanced Launch Options -> Game Language.

Please see the following for information on changing the game language on your console:

PlayStation: https://manuals.playstation.net/document/en/ps4/settings/syslanguage.html

Xbox:
https://support.xbox.com/en-IE/xbox-one/console/locale-faq

For more information check this article out:
https://answers.ea.com/t5/Titanfall-2/Titanfall-2-Changing-Language/td-p/5656402