Add command for loading po files

trans/management/commands/loadpo.py

+from django.core.management.base import BaseCommand, CommandError
+from trans.models import SubProject
+
+class Command(BaseCommand):
+    help = '(re)loads translations from disk'
+    args = '<project/subproject>'
+
+    def handle(self, *args, **options):
+        for arg in args:
+            prj, subprj = arg.split('/')
+            SubProject.objects.get(slug = subprj, project__slug = prj).create_translations()