manage.py makemessages won’t work because apps are located under the apps directory. Instead you need to use django-admin.py from each app directory. For instance to generate .po files (translation source files) for the member app:
cd apps/member/
django-admin.py makemessages -a -e html,txt
Similarly, to regenerate .mo files (compiled translation files), you do this:
cd apps/member/
django-admin.py compilemessages
Alternatively, fabric tasks are available to do this on all translated apps for you:
fab devenv make_messages
Do your translation work, and then run:
fab devenv compile_messages