[DO NOT MERGE] make html5validator fail.

Author: php-coder

expected-validator.log

@@ -0,0 +1,3 @@
+ERROR:html5validator.validator:"file:src/main/webapp/WEB-INF/views/participant/add.html":172.3-172.12: info warning: Element name "th:block" cannot be represented as XML 1.0.
+"file:src/main/webapp/WEB-INF/views/participant/add.html":172.3-172.12: error: Element "th:block" not allowed as child of element "body" in this context. (Suppressing further errors from this subtree.)
+"file:src/main/webapp/WEB-INF/views/site/events.html":15.2-15.8: error: Element "head" is missing a required instance of child element "title".

src/main/webapp/WEB-INF/views/participant/add.html

@@ -169,8 +169,10 @@ <h3 th:text="${#strings.capitalize(header)}">
 		</div>
 
 		<!-- Placed at the end of the document so the pages load faster -->
+		<th:block>
 		<script src="http://yandex.st/jquery/1.9.1/jquery.min.js" th:src="${JQUERY_JS}"></script>
 		<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" th:src="${BOOTSTRAP_JS}"></script>
 		<script src="../../../../javascript/participant/add.js" th:src="${PARTICIPANT_ADD_JS}"></script>
+		</th:block>
 	</body>
 </html>

src/main/webapp/WEB-INF/views/site/events.html

@@ -8,7 +8,6 @@
 		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
 		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
 		<meta name="robots" content="noindex" />
-		<title th:text="|#{t_my_stamps}: #{t_suspicious_activities}|">My stamps: suspicious activities</title>
 		<link rel="shortcut icon" type="image/x-icon" href="../../../favicon.ico" th:href="${FAVICON_ICO}" />
 		<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" th:href="${BOOTSTRAP_CSS}" />
 		<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/usrz/bootstrap-languages@3ac2a3d2b27ac43a471cd99e79d378a03b2c6b5f/languages.min.css" th:href="${BOOTSTRAP_LANGUAGE}" />