✨(domains) enhance again required action modal content

Enhance DNS required actions and explanations

src/frontend/apps/desk/src/features/mail-domains/domains/__tests__/MailDomainView.test.tsx

@@ -89,7 +89,7 @@ describe('<MailDomainView />', () => {
 
     // Verify DNS configuration section
     expect(
-      screen.getByText(/Diagnostic status performed by the server/i),
+      screen.getByText(/Result of the diagnosis performed by the server/i),
     ).toBeInTheDocument();
     expect(screen.getByText(/imap.ox.numerique.gouv.fr./i)).toBeInTheDocument();
     expect(

src/frontend/apps/desk/src/features/mail-domains/domains/components/MailDomainView.tsx

@@ -86,10 +86,10 @@ export const MailDomainView = ({ mailDomain, onMailDomainUpdate }: Props) => {
         >
           <pre>
             {t(
-              'The domain is currently in action required status. Please take the necessary actions to resolve those following issues.',
+              'Actions are required on this domain. Please take the necessary actions to resolve those following issues.',
             )}
           </pre>
-          <h3>{t('Diagnostic status performed by the server')}</h3>
+          <h3>{t('Result of the diagnosis performed by the server')}</h3>
 
           <pre>
             {mailDomain.action_required_details &&