RTL margin-left for capa `.submission_feedback`
RTL for capa `.choicegroup`
RTL for course sequence nav arrow buttons
RTL for course sidebar accordion icons
Added myself (@OmarIthawi) to AUTHORS
RTL fixes for registeratiion/login/forgot-password pages
RTL text contents in error pages
RTL for discussion home page
RTL discussion thread page
RTL for `ul` and `ol` in discussion markdown
RTL for instructor dashboard
Converted transform to cross-browser mixin
Merge pull request #5309 from Edraak/frances/experiments/rtl

LMS RTL Fixes for frances/experiments/rtl