Changed spelling of the Spanish version of the short name for August in the datepicker from 'ogo' to 'ago'.   See SF Support Requests #625.   (Upgrading to jQuery UI 1.11 will have to wait as the 1.11 file structure has been changed).

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2869 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7