Completed translation of '02 Write Concern' into Spanish. Fix #327.
Several edits for #327.
Merge pull request #336 from puentesarrin/issue-327

Completed translation of '02 Write Concern' into Spanish. Fix #327.
Translated lectures 21-24 for Week 5. Resolves #323
Merge branch 'master' of https://github.com/MongoDBPeru/subte