fix TestResource

src/main/java/de/w665/fluidcms/rest/mapping/TestResource.java

@@ -18,6 +18,6 @@ public class TestResource {
     @Produces(MediaType.TEXT_PLAIN)
     public RestResponse<String> test() {
         testRepo.insert("testString");
-        return RestResponse.ResponseBuilder.ok("test").build();
+        return RestResponse.ResponseBuilder.ok("Inserted testString into db.").build();
     }
 }