[es] Update translation

Signed-off-by: Pablo Lezaeta <prflr88@gmail.com>
Merge pull request #129 from jristz/master

[es] Update translation
Update po files.
Fix an allocation issue (XFree vs Release).
Set _NET_WM_WINDOW_OPACITY on the frame if set on a client window.
Use client visual for frame (issue #130).
Fix visual/depth use.