Translated Week5-Using_-Lecture. Close #395.
Translated Week5-Using_-Answer. Close #396.
Translate 03a-The_Aggregation_Pipeline-Lecture. Closes #386
Translate 02a-Simple_Aggregation_Example-Lecture. Closes #385
Fixes according to comments from Jorge Puente-Sarrín. #385
Merge pull request #410 from juancarlosfarah/master

Translate 03a-The_Aggregation_Pipeline-Lecture. Closes #386
Translated 09b-Index_creation_options_sparse-Answer. Closes #390
Translated 05a-Multikey_Indexes-Lecture. Closes #387
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
Edits according to feedback, refs #369.
Fixes according to feedback from @puentesarrin #388.
Merge pull request #413 from juancarlosfarah/issue-388

Translated 07-Installing_MongoDB_mac-Lecture. Closes #388.
Translated 11-Multikeys. Closes #391
Translated 15-Hello_World_on_a_Web_Server. Closes #392
Fix translation for a minor bad transcription. refs #396.
Several edits. refs #395.
Minor edit. refs #395.
Fixed typo according to comments by @puentesarrin #387