Turn "email server" in groupware settings to link to mail settings

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

apps/dav/templates/settings-admin-caldav.php

@@ -37,7 +37,19 @@ script('dav', [
 			<?php ($_['send_invitations'] === 'yes') ? print_unescaped('checked="checked"') : null ?>/>
 		<label for="caldavSendInvitations"><?php p($l->t('Send invitations to attendees')); ?></label>
 		<br>
-		<em><?php p($l->t('Please make sure to properly set up the email server.')); ?> <a href="../admin#mail_general_settings">↗</a></em>
+		<em>
+			<?php print_unescaped(str_replace(
+				[
+					'{emailopen}',
+					'{linkclose}',
+				],
+				[
+					'<a href="../admin#mail_general_settings">',
+					'</a>',
+				],
+				$l->t('Please make sure to properly set up {emailopen}the email server↗{linkclose}.')
+			)); ?>
+		</em>
 	</p>
 	<p>
 		<input type="checkbox" name="caldav_generate_birthday_calendar" id="caldavGenerateBirthdayCalendar" class="checkbox"