How to customize the label for reject and approve button in IM WF task?
Edit the IMSResources.properties file. Modify following lines:
imstask.label.button.reject=Reject
imstask.label.button.approve= Approve
For English localization modify the file: IMSResources_en.properties located under \iam_im.ear\custom\resourceBundles
Restart the application server.