started documenting wikistats. Starting small, with WikiReportsLocalizations.pm module and the method  GetLanguageNamesFromSVN. Will continue to do this to increase understanding of the code.

Change-Id: Ieded2ed0e14c3a92c302aab4243e1653767cdca3
Merge "started documenting wikistats. Starting small, with WikiReportsLocalizations.pm module and the method  GetLanguageNamesFromSVN. Will continue to do this to increase understanding of the code."