VOTE-1019: Add Field grouping for screen readers

[rkoch2]

This ticket aims to accomplish two things:

1. Add an aria-label to the blue informative alert so that a screen reader will read its text contents (before, the screen reader would skip over this element completely)
2. Add field groupings (eg. to all of the name-related fields on the Personal information page) for screen readers

To test, open the NVRF form filler and run WAVE. The blue informative alert should have an aria-label, like below:

The associated fields should be contained within a

with role "group" and an appropriate aria-label, like below:

Repeat this for the Personal Information and Address pages (which have both informative alerts and Fieldsets). Also check the informative alerts on the Identification and Political party pages.