EDSC-3067: Fix 508 compliance 'Empty form label' findings

[mreese84]

Please review Contribution.md before contributing to this project.

Description

Path	Finding	Location	Element
/projects	Empty form label	Under email address box
/projects	Empty form label	Under spatial subsetting (optional) box header
/projects	Empty form label	Under 'Click to enable' button under spatial subsetting
/projects	Empty form label	Under 'Band Subsetting' box header

Files

Acceptance Criteria

Fix 'Empty form label' for all findings to be 508 compliant.