Hints per lesson (#314)

Squashing and merging ...

* Each assigment should have the options to have its own set of hints #278

* Updating lessons due to changes from #278

* Enable i18n client side #312

* IDOR move hints to assignment and enable i18n #312

webgoat-container/src/main/java/org/owasp/webgoat/WebGoat.java

@@ -30,6 +30,7 @@
  */
 package org.owasp.webgoat;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import lombok.SneakyThrows;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.catalina.Context;
@@ -49,8 +50,10 @@ import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletCon
 import org.springframework.boot.web.support.SpringBootServletInitializer;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Primary;
 import org.springframework.context.annotation.Scope;
 import org.springframework.context.annotation.ScopedProxyMode;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
 
 import java.io.File;
 import java.util.Arrays;
@@ -68,6 +71,15 @@ public class WebGoat extends SpringBootServletInitializer {
         SpringApplication.run(WebGoat.class, args);
     }
 
+    @Bean
+    @Primary
+    public Jackson2ObjectMapperBuilder jacksonBuilder() {
+        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
+        builder.indentOutput(true);
+        builder.serializationInclusion(JsonInclude.Include.NON_NULL);
+        return builder;
+    }
+
     @Bean(name = "pluginTargetDirectory")
     public File pluginTargetDirectory(@Value("${webgoat.user.directory}") final String webgoatHome) {
         return new File(webgoatHome);