add method to get default translation

pom.xml

@@ -10,7 +10,7 @@
 
   <groupId>one.shandan</groupId>
   <artifactId>pljava-jsword</artifactId>
-  <version>0.0.4-SNAPSHOT</version>
+  <version>0.1.0-SNAPSHOT</version>
 
   <!-- Coordinates are nice, but so are names and descriptions for humans. -->
 

src/main/java/PlJavaJSword.java

@@ -116,5 +116,9 @@ public class PlJavaJSword {
       return null;
     }
   }
+  @Function(effects=IMMUTABLE, trust=SANDBOXED)
+  public static String getDefaultTranslation(){
+    return DEFAULT_BOOK;
+  }
 }