->l expects two parameters

core/templates/layout.guest.php

@@ -12,9 +12,10 @@
 			var oc_appswebroots = <?php echo $_['apps_paths'] ?>;
 			var oc_requesttoken = '<?php echo $_['requesttoken']; ?>';
 			var oc_requestlifespan = '<?php echo $_['requestlifespan']; ?>';
+			var datepickerFormatDate = <?php echo json_encode($l->l('jsdate', 'jsdate')) ?>;
 			var dayNames = <?php echo json_encode(array((string)$l->t('Sunday'), (string)$l->t('Monday'), (string)$l->t('Tuesday'), (string)$l->t('Wednesday'), (string)$l->t('Thursday'), (string)$l->t('Friday'), (string)$l->t('Saturday'))) ?>;
 			var monthNames = <?php echo json_encode(array((string)$l->t('January'), (string)$l->t('February'), (string)$l->t('March'), (string)$l->t('April'), (string)$l->t('May'), (string)$l->t('June'), (string)$l->t('July'), (string)$l->t('August'), (string)$l->t('September'), (string)$l->t('October'), (string)$l->t('November'), (string)$l->t('December'))) ?>;
-			var firstDay = <?php echo json_encode($l->l('firstday')) ?>;
+			var firstDay = <?php echo json_encode($l->l('firstday', 'firstday')) ?>;
 		</script>
 		<?php foreach($_['jsfiles'] as $jsfile): ?>
 			<script type="text/javascript" src="<?php echo $jsfile; ?>"></script>

core/templates/layout.user.php

@@ -13,10 +13,10 @@
 			var oc_current_user = '<?php echo OC_User::getUser() ?>';
 			var oc_requesttoken = '<?php echo $_['requesttoken']; ?>';
 			var oc_requestlifespan = '<?php echo $_['requestlifespan']; ?>';
-			var datepickerFormatDate = <?php echo json_encode($l->l('jsdate')) ?>;
+			var datepickerFormatDate = <?php echo json_encode($l->l('jsdate', 'jsdate')) ?>;
 			var dayNames = <?php echo json_encode(array((string)$l->t('Sunday'), (string)$l->t('Monday'), (string)$l->t('Tuesday'), (string)$l->t('Wednesday'), (string)$l->t('Thursday'), (string)$l->t('Friday'), (string)$l->t('Saturday'))) ?>;
 			var monthNames = <?php echo json_encode(array((string)$l->t('January'), (string)$l->t('February'), (string)$l->t('March'), (string)$l->t('April'), (string)$l->t('May'), (string)$l->t('June'), (string)$l->t('July'), (string)$l->t('August'), (string)$l->t('September'), (string)$l->t('October'), (string)$l->t('November'), (string)$l->t('December'))) ?>;
-			var firstDay = <?php echo json_encode($l->l('firstday')) ?>;
+			var firstDay = <?php echo json_encode($l->l('firstday', 'firstday')) ?>;
 		</script>
 		<?php foreach($_['jsfiles'] as $jsfile): ?>
 			<script type="text/javascript" src="<?php echo $jsfile; ?>"></script>