I've decided to use subdirectories for my translated versions of my site since I want them to get indexed quickly, and I won't be doing link exchanges w/ the foreign versions.

My question is, would it be better to have the german version for example, in a "de" subdirectory or "deutsch"? I would think deutsch is better for seo, but I never see anybody do that, and I can't get any more info on it. I suppose from a usability standpoint, de is better since its shorter. Would sacrificing that little bit of usability (and breaking the standard) be worth the gain in search engine rankings? Any advice would be appreciated.