Prevent TRNSLATE lumps from being recognized as valid sprite names

TRNSLATE is a valid, but extremely unlikely sprite name:

• The sprite name is TRNS
• The frame is L, rotation A; mirrored to frame T, rotation E

In the very unfortunate event that TRNSLATE is found between sprite lumps, it cannot be considered a valid sprite name.

Test addon: test-fix-trnslate-lumps-being-recognized-as-sprite-names.wad

When added, this addon should print the following message to the console:

WARNING: Bad sprite name: TRNSLATE