Added DTDs for thymeleaf

module-server/src/main/resources/templates/error.html

@@ -1,5 +1,5 @@
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
+<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-4.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" lang="en">
 <th:block th:insert="~{errorIncludes :: head}"/>
 <body>
 <th:block th:insert="~{errorIncludes :: mainText}"/>

module-server/src/main/resources/templates/error/404.html

@@ -1,5 +1,5 @@
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
+<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-4.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" lang="en">
 <th:block th:insert="~{errorIncludes :: head}" />
 <body>
 <th:block th:insert="~{errorIncludes :: mainText}" />

module-server/src/main/resources/templates/errorIncludes.html

@@ -1,5 +1,5 @@
-<!DOCTYPE html>
-<html xmlns:th="http://www.thymeleaf.org">
+<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-4.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" lang="en">
 <head th:fragment="head">
   <title>Error <th:block th:text="${status}"/> (<th:block th:text="${error}"/>)</title>
   <style>

module-server/src/main/resources/templates/version.html

@@ -1,5 +1,5 @@
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
+<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-4.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" lang="en">
 <head th:fragment="head">
   <title><th:block th:text="${version}"/></title>
   <style>