Translate Appointments+ plugin to Spanish

Hi people from wpmudev. I have been trying to translate the appointments+ plugin to spanish but i see no effect on the frontend. I searched your answers to other peoples on the same matter but still not working. I did the following. downloaded Poedit, translated most of it, saved and .po and .mo where generated. Uploaded to /plugins/appointments/languages and deleted the original .pot. So now languages contains only appointments-sp_SP.po and appointments-sp_SP.mo Checked the wp-config. Setted the WPLANG on wp-config because it was empty to sp_SP but still nothing on the frontend. I see that the comments before the WPLANG line says that there should be a folder wp-content/languages with the .po and .mo but i dont have the folder /languages created. Only the one inside the plugin folder. If you can help me i would appreciate it. Thanks in advance