Foz d91da8b442 Fix slab descriptions.
A regression caused the description of slabs to revert to the source block's description.  This commit fixes the regression and adds descriptions which were missing for the recently added slabs (two_sides, three_sides, and three_sides_u).

Closes minetest-mods/moreblocks#96
2017-12-28 19:59:38 -08:00
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