[Issue #193] Internationalization aqquired
[Issue #193] added links to change locale in the navbar
Merge branch 'master' of github.com:MGhanem/smartsoft-13 into C4_m0hamed_C5F2_switch_locales
[Issue #193] added translations for the navbar
[Issue #193] Last chosen locale now stored in session to be retrieved later
[Issue #193] Added tests
Language now shown while logged out
Merge branch 'C4_m0hamed_C5F2_switch_locales' into shared_files

Conflicts:
	arability/Gemfile
	arability/app/views/shared/_navbar.html.erb
	arability/config/locales/ar.yml
	arability/config/locales/en.yml
	arability/config/routes.rb