Translated 25b-Python_and_Aggregation_Results-Answer. Closes #405
Translated 26-getLastError-Lecture. Closes #406
Translated 21b-Text_Searches_in_MongoDB-Answer. Closes #400.
Updated according to feedback
Merge pull request #425 from jcarlosgarcia/issue-405

Translated 25b-Python_and_Aggregation_Results-Answer. Closes #405
Updated according to feedback
Merge pull request #427 from juancarlosfarah/issue-400

Translated 21b-Text_Searches_in_MongoDB-Answer. Closes #400.
Merge pull request #426 from jcarlosgarcia/issue-406

Translated 26-getLastError-Lecture. Closes #406
Moving FilesLog.rst to CHANGELOG.rst.
Updated week-specific mapping files.
Grouping captions by week on CHANGELOG.