Minor refactors:

- Renames s_assemble to s_brief
-  Link s_local to s_brief

apps/cic-ussd/tests/cic_ussd/session/test_in_memory_ussd_session.py

@@ -0,0 +1,11 @@
+# standard imports
+import json
+
+# local imports
+from cic_ussd.menu.ussd_menu import UssdMenu
+from cic_ussd.session.ussd_session import UssdSession
+
+
+def test_ussd_session(load_ussd_menu, get_in_redis_ussd_session):
+    ussd_session = get_in_redis_ussd_session
+    assert UssdMenu.find_by_name(name='initial_language_selection').get('name') == ussd_session.state