backend is bad translated in spanish locales (apt locales)

[compermisos]

"trasera" is bad traslation of backend, is only literal translation, cann't reflect the tecnical data on the word

in other proyects is not traslated, and is a tecnical word

not exist a word in spanish reflect the concept, the options create along traslation and add the original word

note, exist other proyect whi this problem