Are there standard ways of translating item names into other languages? The wiki site http://minecraft.gamepedia.com supports multiple languages (see its left side menu). But is this site considered official? Are there better resources?
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1.9 recipes at minecraftcells - the Handy Crafting Guide
You could change the language in the Settings and check the names in-game if you wanted to be certain, in the Creative inventory you can find all the blocks, I don't know about mobs and drops though, the Wiki is probably your best source there.
The Wiki is "The official Minecraft wiki" but it is maintained by us players so the information doesn*t come from Mojang.