Updating 17-JSON_Revisited with recent changes.
Copied 17-JSON_Revisited to Spanish_es directory before to translation.
Completed translation of the new 'JSON_Revisited' into Spanish. Close #235.
Merge pull request #236 from puentesarrin/issue-235

Completed translation of the new 'JSON_Revisited' into Spanish. Close #235.
Edited lectures 21-30 for Week2.
Edited new JSON_Revisited file.
Finished editing Week 2.
Renaming mapping directory & files.
JSON Arrays lecture was deprecated.
JSON Arrays lecture was deprecated, fixing file names.