Better Spanish wording

According to [this](https://groups.google.com/d/topic/git-users/O3ILG2uoCmk/discussion) 
post, the word "pelearse" should be replaced with "bregar".

I don't speak Spanish myself, so I can't vouch for it personally.
Even better Spanish wording

I just discussed it with a native speaker, and she suggested that trabajar or manejar (to handle) is a better word. 

"Wrangle" doesn't translate so well into Spanish in this context.
Merge pull request #343 from tfnico/patch-1

Better Spanish wording