update ar translation
update ar translation

Change-Id: I9c966fe2b9fb9d68e624dc88c675c0d004c71146

djbender/canvas-lms,fronteerio/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,HotChalk/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,djbender/canvas-lms,HotChalk/canvas-lms,fronteerio/canvas-lms