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

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg rollback
hg verify
hg parents
hg status