translate more things

[bgates]

You'll notice the little dropdown in the top right corner can display some elements of the page in Spanish, namely those things that the developer added. Those are all stored in as es.yml file in config/locales. Most of the page, though, is the book descriptions, which can't be assumed to be in that file because they can be added by bookstore employees after the developer is gone. Still, it would be nice to have some kind of translating mechanism that would get Spanish language descriptions of the books displayed.