Custom post categories not available to rename

I have installed this plugin and renamed my customer post type and it is working just fine. But the problem is my custom post category is available there so that I can rename.

Here is the complete scenario:

I have custom post type “Portfolio”. This custom post type also show “Portfolio Categories” and “Portfolio Tags” in admin area menu like we see in page and post. In plugin I didn’t see any option to rename Portfolio Categories to Package Categories or something else. Similarly for tags.

Please help.