REST API endpoints return wrong color names for statuses.
For instance, this endpoint GET /rest/api/3/statuscategory

For "In progress" the returned color is "yellow", but in the browser, it is blue. 

Example from a test instance:

API response from /rest/api/3/statuscategory:

    {
        "id": 4,
        "key": "indeterminate",
        "colorName": "yellow",
        "name": "In Progress"
    }, 

Additionally, the API is returning some colors that seems to be undocumented on https://atlassian.design/foundations/color

For example:

    {
        "id": 2,
        "key": "new",
        "colorName": "blue-gray",
        "name": "To Do"
    }, 

Looks like the "blue-gray" color is not documented, would be interesting to use the documented standard ADS colors.