Update ar.js

Two versions in months together and changes in weekdays,
so that the translation is more general.
Partially update ar tests 'format'
Update ar.js

Update ll of 'format' in tests
Update ar.js

Attempt to update 'format month' in tests for ar
Update ar.js

Attempt to update 'format week' for ar tests
Update ar.js

More detail in parse message for ar testing
Added support for three word arabic months
Removed commented code
Merge pull request #712 from ichernev/bugfix/fixed-arabic-months

Bugfix/fixed arabic months