Move your mouse pointer to the lower right hand side of the screen, and click on the time clock.
Select the settings icon.
Select advanced settings (configuración avanzada).
Under Languages and Input (idiomas y entrada) section, select language (Idioma).
Select the language that you want to use on the chromebook.
NOTE: From Spanish to English select (ingles - Estados Unidos).
If you don't see the language that you want to use, select on "Add Languages". Add the one that you'd like to use.
Select "Display Chrome OS in this language".
Restart the machine. Your language should be back to english.