Datepicker: Update Arabic locales

I've updated the following Arabic locales:
- ar
- ar-DZ

and added the following:
- ar-IQ
- ar-JO
- ar-LB
- ar-MA
- ar-MR
- ar-PS
- ar-SY
- ar-TN

The update was based mainly on Common Locale Data Repository (CLDR) data v25 by unicode.org, in addition to some wikipedia references regarding first day of week and date format.