Fix an issue when pushing lazystrings to database

hiboo/account/login.py

@@ -43,7 +43,7 @@ def signup():
             models.db.session.add(user)
             models.db.session.add(auth)
             models.log(models.History.SIGNUP,
-                comment=_("Signed up using the Web form"), user=user)
+                comment=str(_("Signed up using the Web form")), user=user)
             models.db.session.commit()
             flask.flash(_("User created successfully"), "success")
             return flask.redirect(utils.url_or_intent("account.home"))