There's actually a faces.dat and it's possible this is what was corrupted in the crash.
If you have an old one from a previous save, you might be able to copy that one over the corrupt one and restore (most) of the original faces. Just keep a backup of the .dat files before trying.
Generally the .dat are not mix and match, so don't try this with the other ones, but the faces one can sometimes be replaced without issues.
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