This API was introduced in Textbox.io release 2.4.1
The custom colour picker was added in Textbox.io release 2.4.2
The default set of colors includes a color name used for the tooltip and ARIA label. These names are translated to all supported languages, and the API allows use of these translations. To use a translated name, set the text of a custom color to one of the
Translation Key entries from this table; translation even works if the text is not provided but the color matches a translation key.
The default colors, in order, are: