The sulfuric rock furnace's display name is block.betterendforge.sulphuric_rock_furnace.

Strange. The name shows up correctly ingame for me as 'Sulfuric Rock Furnace', and there is an entry for block.betterendforge.sulphuric_rock_furnace in the en_us file, so everything should work.

Apologies, this must have been fixed in a recent update, as it appears to no longer be an issue.