First version translated into Spanish from the firt 5 tutorials in package learnr (referring to the v1 of r4ds book)

[xavidp]

First version translated into Spanish from the firt 5 tutorials in package learnr (referring to the v1 of r4ds book) I couldn't finish the check package task since for some unknown reason, no pdflatex is available (apparently) even after installing tinytex, or removing tinytex and installing miktex-portable and restarting R each time.

PR task list:

• [X] Update NEWS
• [X] Update documentation with devtools::document()

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[xavidp]

I added also some new translation to the learnr UI into Spanish