Alter labels of paraview plugin xml

Paraview provides many sources and filters by its sources.xml and filter.xml, of which custom app is able to choose a subset to generate corresponding menu content.
But what if I want them with different labels(i.e. text displayed on menu)? I see that the label property is nested in SourceProxy in paraview source instead of proxy in custom app.
For example, how could I change label ‘Clean’ to ‘Cleaning
My intention is to make it more understandable, thanks.