If your menus change but the race engineer or podium interviews stay in the original language, your game copy might lack the full voiceover pack. In that case:
If you have a slow connection or want to avoid the download, try this (works for some Steam versions): f1 2013 change language free
If the game was installed from a disc or another source and you cannot find the language tab, you may need to check the game's root directory for a configuration file. If your menus change but the race engineer