I checked in OpenIV and the files you need to restore from the game folder to the mod folder are:
update\update.rpf\x64\data\cdimages\scaleform_fonted.rpf
update\update.rpf\x64\data\cdimages\scaleform_platform_pc.rpf
If you replaced/modified the game files themselves, you need to verify integrity, assuming your game isn't pirated.