VPN-5293: Add missing a11y names in "Contact Support" screen

[vinocher]

Description

"Contact Support" screen's ComboBox and "Describe Issue" TextArea did not have a11y names, so were not read by the screen reader.

Also fixed:

1. Shift+Tab in the "Describe Issue" TextArea was being input into the TextArea instead of moving to the previous control.
2. Subtitle in Home screen was not accessible.

Reference

VPN-5293, GitHub 7631

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[lesleyjanenorton]

R+ with one question. Thanks @vinocher !