[Issue #193] Redid my work after wrong merge into master
[Issue #193] Added documentation
Merge branch 'master' of github.com:MGhanem/smartsoft-13 into C4_m0hamed_C5F2_switch_locales

Conflicts:
	arability/app/controllers/application_controller.rb
	arability/config/routes.rb
[Issue #193] Removed extra lines
[Issue #202][WIP] the test are written but still need fixes
Merge branch 'C4_m0hamed_C5F2_switch_locales' of https://github.com/MGhanem/smartsoft-13 into C4_nourhanZ_C4S07_VS_education
[Issue #202][WIP] changed something in the method that calculate age statistics and changed a condition in the view