update ar translation
update ar translation

Change-Id: Iaa0c5c3369b6df99355ac1b2d11f6b9ff814aba1

sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,matematikk-mooc/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,matematikk-mooc/canvas-lms