theme(account): add note about personal data

account/account.ftl

@@ -39,6 +39,9 @@
       <input type="text" class="ps-input" id="email" name="email" autofocus value="${(account.email!'')}"/>
     </div>
 
+    <h3>Personal details</h3>
+    <p>Please note that providing identifying data is not required and should be done with great care. At the moment, your first name and last name are only displayed in Nextcloud.</p>
+
     <div class="ps-form-group ${messagesPerField.printIfExists('firstName','has-error')}">
       <label for="firstName" class="ps-form-group--label">${msg("firstName")}</label>