Name for "issuetype" field is returned as "Issue Type" instead of "Request Type" in REST API for next-gen JSD projects

Issue Summary

In the issue REST API (/rest/api/3/issue/{issueIdOrKey}), the name for the "issuetype" field is returned as "Issue Type" for next-gen JSD projects when it should be "Request Type". In our native apps, we display the field name in our Issue screen and showing an "Issue Type" can be confusing/misleading.

Steps to Reproduce

1. Find or create an issue in a next-gen JSD project
2. Fetch the issue via the issue REST API (/rest/api/3/issue/{issueIdOrKey})
3. Inspect the JSON

Expected Results

The name for the "issuetype" field is "Request Type"

Actual Results

The name for the "issuetype" field is "Issue Type"

"editmeta": {
    "fields": {
[...]
      "issuetype": {
        "required": false,
        "schema": {
          "type": "issuetype",
          "system": "issuetype"
        },
        "name": "Issue Type",
        "key": "issuetype",
[...]

Workaround

We could rename the field name client-side but that would require the same change in all clients and can lead to localisation mismatches.