Rework Button component to pass its label via children content

packages/app/components/contact/ContactFormPopup.tsx

@@ -120,7 +120,9 @@ const ContactFormPopup: ComponentType<Props> = ({ initEmail = '', onSubmit, onCl
                     />
                 </div>
 
-                <Button label={<Message key="send" defaultMessage="Send" />} block type="submit" disabled={isLoading} />
+                <Button block type="submit" disabled={isLoading}>
+                    <Message key="send" defaultMessage="Send" />
+                </Button>
             </Form>
         </Popup>
     );

packages/app/components/contact/SuccessContactFormPopup.tsx

@@ -30,7 +30,9 @@ const SuccessContactFormPopup: ComponentType<Props> = ({ email, onClose }) => (
         </div>
 
         <div className={styles.footer}>
-            <Button label={<Message key="close" defaultMessage="Close" />} block onClick={onClose} />
+            <Button block onClick={onClose}>
+                <Message key="close" defaultMessage="Close" />
+            </Button>
         </div>
     </Popup>
 );