Implement semester PL/pgSQL function

sql/apisub_functions.sql

@@ -88,7 +88,7 @@ BEGIN
   IF m = 1 OR m = 2 OR m = 3 THEN
     RETURN 'H';
   /* Summer intersemester is either june or july or august or september */
-  ELSIF m = 6 OR m = 7 OR m = 3 OR m = 9 THEN
+  ELSIF m = 6 OR m = 7 OR m = 8 OR m = 9 THEN
     RETURN 'E';
   ELSE
     RETURN 'X';