SAP BPM and no refresh of UI written in UI5

Hello,

now I started to implement UIs for SAP BPM in UI5 instead of WebDynpro.

In NWDS I had to create two Development Comonents (DC):

1. J2EE Web Module containing the UI
2. EAR with the Webmodule as dependency

I followed this steps: SAPUI5 Integration into SAP BPM Made Easy

In the Standard-Project (after the NWDS wizard to create a UI), there is a model containing Strings.

These Strings define the texts of Buttons, Form Elements, Header, ...

I changed one String in another Header Text.

Additionally I added one more textfield in the view.

Now I expect to see a new text in header and a new clear textfield.

After changing the source I "Build"* the Web Module DC and I "Deploy"* the EAR containing this Module as Dependency.

After starting the BPM process I get the Task and the UI of the Human Activity but in UI nothing changes.

No text change. No new textfield.

Why?

Thanks for help in advance.

* Commands in Development Infrastructure