The gamemode TAB token was able to control the name of the tabs in the old UI. This needs to be updated for the new UI, including adjusting the TAB token parameters to match the new UI's tabs.
Converted the TAB token to work with the new tabs (only names for now). As well as the 'making it work' part, this included:
Renamed the TAB keys to match the new tabs
Removed keys for tabs that no longer exist
Updated existing game modes to use the new names and remove deprecated entries.
Updated the docs to show the full set of possible values.