Function documentation in Spanish

[thegargiulian]

Ideally, we would be able to produce nicely formatted documentation in both Spanish and English for all aspects of the code and have that organized in a easy to access way for all users.

I've asked around the R-Ladies Slack for best practices for multilingual documentation and was suggested to take a look at this proof of concept: https://github.com/eliocamp/translated

[thegargiulian]

This might be a helpful resource: https://michaelchirico.github.io/potools/