GT4T Mac has updated to 1.05.181031.
You can now use ‘Command+Control+j’ to MT translate current segment.
‘Command+Control+k’ to MT translate next segments.
‘Command+Shift+j’ to MT translate several segments.
The new supported CAT list on Mac:
Memsource Editor (online & offline version)
If your CAT is not in the list please let me know.
Again the usual ‘Command+j’ and ‘Command+Option+j’ works on selections in all apps.