Updated command tables in commands.py and hgext extensions. - Marked for translation where extensions already had _() - Corrected indentation - fixed a few synopsises

#!/bin/sh

hg
hg -q
hg help
hg -q help
hg add -h
hg add --skjdfks
hg help diff
hg help status
hg -q help status
hg help foo
hg skjdfks

exit 0