Factor out stats updating

trans/models.py

@@ -226,13 +226,18 @@ class Translation(models.Model):
         Unit.objects.filter(translation = self, id__in = oldunits).delete()
 
         # Update revision and stats
+        self.update_stats(False)
+        self.revision = blob.hexsha
+        self.save()
+
+    def update_stats(self, dosave = True):
         total = self.unit_set.count()
         fuzzy = self.unit_set.filter(fuzzy = True).count()
         translated = self.unit_set.filter(translated = True).count()
         self.fuzzy = round(fuzzy * 100.0 / total, 1)
         self.translated = round(translated * 100.0 / total, 1)
-        self.revision = blob.hexsha
-        self.save()
+        if dosave:
+            self.save()
 
     def git_commit(self, author):
         '''