Translated
Completed translation of '16 sort' into Spanish. Close #302.
Updated after watching the videos
Minor edits for #302.
Updated after feedback
Merge pull request #306 from puentesarrin/issue-302

Completed translation of '16 sort' into Spanish. Close #302.
Merge pull request #311 from jcarlosgarcia/double-group

Completed translation of "13-Double_group_stage" parts a and b. Resolves #297