Added missing Spanish strings to getmonero.org
Added the missing Spanish strings missing from FAQ and MRL sections. Also fixed one or two minor grammatical errors. This is following reddit post https://www.reddit.com/r/Monero/comments/a6qo23/translators_needed_for_getmoneroorg_arabic/
*I was not able to jekyll build, something seems to be wrong when building. Maybe you guys have the same error or is just me, but the text is well placed.
Thank you guys. :)