When I went into my texturepacks folder (in game) right after I got 13w09a, the name & description of the (outdated) texturepack were just jumbles of blck, red, & a light gray. I'm not sure, but I think this is a cause of the lang folder change.
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Duplicate of MC-10309, please use the search function to see if your bug has already been submitted. Currently over 52% of tickets are being closed as duplicate.