gt-console.py: fix plural_name
Switch to python2

(At commit b704539b0f92d754f6b6df2a031bb1454e9e9187)
$ time python3 gt-notify.py 2>/dev/null

real    0.48s
user    0.43s
sys     0.04s

(Now)
$ time python2 gt-notify.py 2>/dev/null

real    0.23s
user    0.17s
sys     0.06s

Nuff said.