Get.gov: choose your domain screen reader output

[AnnaGingle]

Issue Description

Input field
get.gov's Start your .gov domain search programmatic label is Check Domain Name input Check Domain input
This fails section 508 success criteria (SC) 1.3.1-programmatic-label because the ANDI / screen reader output does not adequately define the form element.
The screen reader output should be:
Start your .gov domain search See if the .gov domain you want is available. We'll work with you to find the best domain for your organization that meets our requirements. [Read more about choosing your .gov domain.](https://get.gov/domains/choosing/). Do not include .gov in your search.

Button
the Check availability button screen reader output is Check availability of Domain Name Check Domain Availability. This fails section 508 success criteria (SC) 1.3.1-programmatic-label because the ANDI / screen reader output does not adequately define the form element.
The screen reader output should be:
Start your .gov domain search Check domain availability

Acceptance Criteria:

• For the Start your .gov domain search programmatic label, the screen reader output should be:
  Start your .gov domain search See if the .gov domain you want is available. We'll work with you to find the best domain for your organization that meets our requirements. [Read more about choosing your .gov domain.](https://get.gov/domains/choosing/). Do not include .gov in your search.

• For the Check availability button, the screen reader output should be:
  Start your .gov domain search Check domain availability

• Make the relation between the label and the link clear for screen reader users, use the add the aria-describedby attribute to the label that points to the link.

Additional context

No response

Links to other issues

No response

Prioritization Comments

WCAG Conformance Level:
WCAG Standard that applies:
Critical Failure if Not Met?:
Prioritization:
Reason:

[AnnaGingle]

This is a dev ticket