editing a filter

Hello. Does anyone know where the source code for filters are? I want to
edit the Normalize filter and also edit the user interface for the
Normalize filter.
I think I have found the source code for the filter here:
weka-3.8\weka\src\main\java\weka\filters\unsupervised\attribute\Normalize.java

but it doesn't seem to control the user interface. For instance there is no
occurrence of the text 'ignoreClass', although this is present in the UI.
Also, although the text 'scale' occurs in Normalize.java, none of those
occurrences of scale seem to be generating the text 'scale' on the UI.
Any suggestions? Thank you.

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