VPAT -- late days (#2926)
VPAT -- late days (#2926)

* VPAT -- Late Days

changed file:
site/app/templates/admin/LateDays.twig

Adjustments for <fieldset>/<legend> and <aria-labelledby>

WIP

* Changes to be committed:
modified:   site/app/templates/admin/LateDays.twig

Adjust submit button, add aria-label to delete control element.

* Changes to be committed:
modified:   site/app/templates/admin/LateDays.twig

Adjust table properties (caption, data table heading)
File upload control given a more robust label with aria-labelledby

Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver