Thank you very much for your help.
I had already delete the whole thing and re-installed again. Followed all instructions to install the languages and installed all the language packs for you component and for Joomla
I set Spanish as the default site language and set all content, modules, menu items, etc. to Spanish as well
I am facing two problems still:
1 - The search module does not translate in all sections; the main page and this
http://vive-cancun.com/go/administracion-de-propiedades.html
2 - There is an error with the ordering in the categories section, it shows "_REALESTATE_MANAGER_LABEL_ORDER_BY " instead of the translation. Example:
vive-cancun.com/go/component/realestatem...enta.html?Itemid=126
I already inspected the files and the line DOES exist in the Spanish.php file, it is exactly the same as in the English.php file but in the back end of Joomla, in the "language-manager" section it does not appear.
Can you help me?
Again, thank you very much!