Hello napster1 here i found these slabs in the game with a BUG:

sandstone slab,
cobblestone slab,
stone brick slab,
nether brick slab,
and
dark oak wood slab
haves the wrong in-game name like:

tile.sandstoneSlab.sandstone.name
tile.stoneSlab.cobblestone.name
tile.stoneSlab.stone_brick.name
tile.stoneSlab.nether_brick.name
and
tile.woodSlab.dark.oak.name