I found this translation error in the new snapshot that came out today (October 17th) . It is on every type of spanish (Argentina, Spain, etc)
The game doesn't recognizes the symbol " ´ ".For example, á, é, í, ó, ú.
Here are some images:
Environment
I have windows 7 ultimate 64 bit and the las version of java 7
Duplicate of MC-35614 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.