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 init
python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
hg ci -Ama -d '1 0'
echo clean diff >> a
hg ci -mb -d '2 0'
hg diff -r0 -r1