VPAT -- excused absences (#2927)
VPAT -- excused absences (#2927)

* VPAT -- Excused Absence Extensions

Changed file:
site/app/templates/admin/Extensions.twig

Adjustment for <label>

WIP

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

Adjust <label> tags
Adjust submit button
Add aria-labelledby attribute to file upload control

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

Data table adjustments (caption, header)

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