Update zh_CN.lang

When I try to translate the GUI of Electric Furnance, which are in the 423th and 424th lines of en_US.lang in galacticraftcore, I find they are written as follow:
gui.electricFurnace.desc.0=gui.electricFurnace.desc.0
gui.electricFurnace.desc.1=gui.electricFurnace.desc.1

Maybe you forgot to write something, or it is what you intended  :)