prevent forms from double-submitting

files/assets/js/core.js

@@ -616,3 +616,13 @@ if (width <= 768) {
 		}
 	});
 }
+
+document.getElementsByTagName('form').forEach(form => {
+	form.addEventListener('submit', (e) => {
+		if (form.classList.contains('is-submitting')) {
+			e.preventDefault();
+		}
+		
+		form.classList.add('is-submitting');
+	});
+});