SmelteryLogic: don't crash when melting Endermen with a Smeltery

A FluidStack was being incorrectly constructed, causing the game to bomb out
when ender fluid was added to the Smeltery.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
LavaTankItemBlock: translate FluidName when rendering tooltip

Without this, it would render with the untranslated string (e.g. "Contains
electrum.molten" or similar).

Signed-off-by: Steven Noonan <steven@uplinklabs.net>