nodebb/src/views/500-embed.tpl

<script>
	window.addEventListener('load', function () {
		define(config.relative_path + '/assets/templates/500.js', function () {
			function compiled(helpers, context, get, iter, helper) {
				return '<div class="alert alert-danger">\n\t<strong>[[global:500.title]]</strong>\n\t<p>[[global:500.message]]</p>\n\t<p>' + 
					helpers.__escape(get(context && context['path'])) + '</p>\n\t' + 
					(get(context && context['error']) ? '<p>' + helpers.__escape(get(context && context['error'])) + '</p>' : '') + '\n\n\t' + 
					(get(context && context['returnLink']) ? '\n\t<p>[[error:goback]]</p>\n\t' : '') + '\n</div>\n';
			}

			return compiled;
		});
	});
</script>