Possibility to change predefined system/menu buttons according to customer requirements

Currently, only the default buttons and texts can be used directly in the menu bar in Webcube.

However, these buttons and texts do not always fit.

For example, our users would expect the translation "Delegate" for the "Hand off task" button. However, we cannot change this.

In the Transmittal process, for example, it would also make sense to change the "Save" button to "Save & Send".

So in general we need the possibility to change system/menu buttons