Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/public/admin/save_error.php

@@ -0,0 +1,9 @@
+<div class="error">
+    <?php foreach ( $msgs as $msg) : ?>
+    <p>
+        <strong>
+            <?php echo $msg; ?>
+        </strong>
+    </p>
+    <?php endforeach; ?>
+</div>