[Patch] Spanish translation of the NanoBSD article.

[Federico Caminiti]

Hi, ever since the new translations system emerged, I've gotten arround to
translating the NanoBSD article, in the hopes that someone can review and
commit it. Since this is only a .po file, all anyone should worry about are
the translation strings.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203402

Although I'm aware there are very few (if any) spanish language committers.
I'll leave this here, in case there is someone who can take a look at this.

Greetings,