update ar translation
update ar translation

Change-Id: I7fffb1f4ca7963beeb6549e1cb60d44701aa5d28

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