YALSM - Yet Another Leather Smelting Mod

Updates per MinecraftForge/MinecraftForge@756c58d.  Officially, 2.1.6 requires clients to be on Forge build 1805 or higher, whereas 2.1.5 required clients to be on Forge build 1804 or lower, but I think you can technically get away with skipping this one if you feel like it because YALSM doesn't use any of the airbreathercore things that had to be updated.  I'd probably do more testing on this with airbreathercore 1.0.1 and skip this if not for...

Also adding de_DE.lang, courtesy of jottyfan, and nl_NL.lang, courtesy of ShadowCoder69.