Translated 09b-Index_creation_options_sparse-Answer. Closes #390
Changed according to feedback
Translated 07-Installing_MongoDB_mac-Lecture. Closes #388.
Merge pull request #411 from jcarlosgarcia/issue-390

Translated 09b-Index_creation_options_sparse-Answer. Closes #390
Fixes according to feedback from @puentesarrin #388.
Merge pull request #413 from juancarlosfarah/issue-388

Translated 07-Installing_MongoDB_mac-Lecture. Closes #388.