Describe your changes

When using ar as locale, week days' short names were identical because we would always slice the full day names on indexes 0 to 2 to format them.

I made an exception for arabic, slicing the weekdays on indexes 2 to 5

This is how it looks like now:

Before	After

Issue ticket number and link

Fixes #1087

Checklist before requesting a review

• I have performed a self-review of my code
• I have ensured that unit tests pass without errors
• If it is a new feature, I have added a new unit test