If you tell me exactly which patch you're using (e.g., SilentPatch, GTA:SA x64, or a specific total conversion), I can guide you step-by-step to recover the English language files from a clean source without breaking any rules.
If the game is functional but just in the wrong language, you can navigate the menus blindly: menu (usually the middle option in the main menu). Select the bottom option ( Language Settings download english language file for gta san andreas patched