update en-GB translation
update en-GB translation

Change-Id: I6bc8f1fa7e4424dbd1c0373f631c150c82710638

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