Fix spelling

program/models.py

@@ -507,7 +507,7 @@ class Schedule(models.Model):
 
             Examples:
 
-              1. If RRule is "Every 1st Monday" and we want its repetition alyways to be on the
+              1. If RRule is "Every 1st Monday" and we want its repetition always to be on the
                  following day, the repetition's RRule is the same but add_days_no is 1
 
                  If we would set the repetition to "Every 1st Tuesday" instead
@@ -819,7 +819,7 @@ class Schedule(models.Model):
                 create.append(projected_ts)
                 continue
 
-            # Check hash (if start, end, rrule or byweekday changed)
+            # Check hash (if start, end, rrule or by_weekday changed)
             if not ts["hash"] in solutions:
                 errors[ts["hash"]] = _("This change on the timeslot is not allowed.")
                 continue