Added listing available queries for users.

Change-Id: I8895226a3fe095f1d997e81fddf7428bb1e9c904
diff --git a/full/src/main/java/de/ids_mannheim/korap/constant/QueryType.java b/full/src/main/java/de/ids_mannheim/korap/constant/QueryType.java
index d223056..cd47332 100644
--- a/full/src/main/java/de/ids_mannheim/korap/constant/QueryType.java
+++ b/full/src/main/java/de/ids_mannheim/korap/constant/QueryType.java
@@ -1,7 +1,13 @@
 package de.ids_mannheim.korap.constant;
 
+import org.apache.commons.lang.StringUtils;
+
 public enum QueryType {
 
     QUERY,
     VIRTUAL_CORPUS;
+    
+    public String displayName () {
+        return StringUtils.capitalize(name().toLowerCase().replace("_", " "));
+    }
 }