Add --from-code parameter to xgettext for a python3 activity
Add --from-code parameter to xgettext for a python3 activity

Signed-off-by: Ibiam Chihurumnaya <4252114dcaac12ac7a29d3bc797f40258ba69fd5@gmail.com>

sugarlabs/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3