If your copy is stuck in a foreign language, spend the 10 minutes to install the English pack. The Rook Islands are waiting, and you deserve to understand every threat, every joke, and every terrifying monologue.
In these versions, the English voice files are often completely stripped from the installation to save disk space and enforce the regional lock. Simply changing the language in the options menu often proves impossible because the option is greyed out or missing entirely. English Language Pack For Far Cry 3