GREG-330: Remove old confirmation-/error message

frontend/src/routes/components/sponsorGuestButtons.tsx

@@ -104,7 +104,7 @@ export default function SponsorGuestButtons(props: SponsorGuestButtonsProps) {
       {cancelledInvitationFor && (
         <Alert
           sx={{ fontSize: '1.375rem', marginTop: '1rem', marginBottom: '1rem' }}
-          severity="info"
+          severity="success"
         >
           {t('guestInfo.invitationCancelled', {
             name: cancelledInvitationFor,

frontend/src/routes/sponsor/guest/guestRoleInfo/index.tsx

@@ -150,6 +150,8 @@ export default function GuestRoleInfo({
     const newEndDate = addDays(-1)(today)
     if (role.start_date !== undefined && role.start_date > newEndDate) {
       setBadEndDate(true)
+      setShowPeriodChange(false)
+      setShowPeriodChangeFailed(false)
     } else {
       role.end_date = newEndDate
       endPeriodPost(role_id, { end_date: newEndDate }, reloadGuests)
@@ -196,7 +198,13 @@ export default function GuestRoleInfo({
       .then((result) => {
         if (result !== null) {
           setShowPeriodChange(true)
+          setBadEndDate(false)
+          setShowPeriodChangeFailed(false)
           console.log('result', result)
+        } else {
+          setShowPeriodChangeFailed(true)
+          setShowPeriodChange(false)
+          setBadEndDate(false)
         }
         // Reload the guest so that the information on the overview page is updated
         reloadGuests()

frontend/src/routes/sponsor/register/stepRegistration.tsx

@@ -177,6 +177,8 @@ export default function StepRegistration() {
 
   const handleBack = () => {
     setActiveStep((prevActiveStep) => prevActiveStep - 1)
+    setFormDataErrorReport(undefined)
+    setSubmitErrorReport(undefined)
   }
 
   const handleForwardFromRegister = (