@yongsheng , actually for this string part, we might need some discussion.
The string must be defined in the final application's resources, here is the app template. And i will put the same one for app hello world.
The application generated from app template will inherit the same strings.

In code, if it finds the resources are not available, it will print the string name with ```_``` replaced to space.(https://github.com/crosswalk-project/crosswalk/pull/744/files#r6535236)
And still web developer can change the string in their applications to whatever they want before package apks.

Do you agree with this way?