MDL-46570 gradereport_history: Converting JS to namespace'd module
MDL-46570 gradereport_history: Safer use of language strings
MDL-46570 gradereport_history: Convert to use templates and selectors
MDL-46570 gradereport_history: Simplifying the select/deselect buttons logic
MDL-46570 gradereport_history: Adding JS documentation
MDL-46570 gradereport_history: Convert to moodle dialogue
MDL-46570 gradereport_history: Improving accessibility and selection mechanism
MDL-46570 gradereport_history: Reworked search and load more mechanism
MDL-46570 gradereport_history: Making the users list an ARIA widget
MDL-46570 gradereport_history: Styling for RTL languages
MDL-46570 gradereport_history: Clean up of styling and minor inconsistencies
MDL-46570 gradereport_history: Update the logic of button helper method
MDL-46570 gradereport_history: Selected users are saved across page loads