F1 2013 English Language Pack Guide

Delete the \language\eng_us\ folder. Verify game integrity (Steam) or re-download a pack explicitly labeled "F1 2013 v1.2 English Language Files."

Before downloading external packs, try this officially supported method: f1 2013 english language pack

Only if Steam auto-download fails. You can copy English files from a friend’s installation or backup: Delete the \language\eng_us\ folder