IMPORTANT!: This is not a full resource pack. This is an addon for a resource pack. You cannot use this on its own, this contains only GUI. For the actual resource pack, go here: http://www.curse.com/texture-packs/minecraft/broken-anachronism-v7-64x-1-5-fo
This addon adds custom language files. It changes many item names, ingame menu text, mob names, and more to be more lore-friendly and suit their textures.
I recommend only using this in survival mode, but if you want to try it in creative, i won't stop you. It just might be a little harder to locate certain items by searching.