update ar translation
update ar translation

Change-Id: I157d2c8398b704cc465cf7237f673be031d70946

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