Spanish language for Newspaper X

Spanish language for Newspaper X.
I don’t know where I have to upload the language files and its names. Help me, please.
Thank you very much.

I’ve uploaded:
wp-content/languages/themes/newspaper-x-es_ES.mo & .po
wp-content/themes/newspaper-x/languages/newspaper-x-es_ES.mo & .po & es_ES.mo & .po
But the theme continues showing English words and sentences…

Pls. help.

Thank you in advance!