Spanish translation, courtesy of Rodo

git-svn-id: svn://svn.icculus.org/fs2open@10615 387891d4-d844-0410-90c0-e4c51a9137d3
Clarified documentation of gr.drawPolygon and gr.drawSphere.

git-svn-id: svn://svn.icculus.org/fs2open@10616 387891d4-d844-0410-90c0-e4c51a9137d3