update ar translation
update ar translation

Change-Id: Iba71bb85665dd4ec35175db3669f3f5a3de5b832

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