Fix typo in let's encrypt mail notification box.

web/templates/admin/edit_mail.html

@@ -98,7 +98,7 @@
                                             <td class="input-label vst-text">
                                                 <span class="alert alert-info alert-with-icon">
                                                     <i class="fas fa-exclamation"></i>
-                                                    <?=__("Let's Encrypt for mail needs a dns record for mail.$v_domain and $v_webmail_alias.$v_domain!")?><br/>
+                                                    <?=__("Let's Encrypt for mail needs a dns record for mail.$v_domain and $v_webmail_alias!")?><br/>
                                                 </span>
                                                 <label><input type="checkbox" size="20" class="vst-checkbox" name="v_letsencrypt" <?php if($v_letsencrypt == 'yes' || $v_letencrypt == 'on') echo "checked=yes" ?> onclick="App.Actions.MAIL.toggle_letsencrypt(this)"> <?php print __('Lets Encrypt Support');?></label>
                                             </td>