Property files or resource bundles

1. How to remove all the duplicate enterpries in resoruce bundles, duplicate by key and not by content
2. How remove all the unused keys with values in property files.

It would be nice feature of Intellij to have these features related to refactoring of resource bundles.
Currently it intellij does hightly these in different colors, but it does not seem to have a way to eliminate all these with one command.

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It could also sugegest unifying of keys, based on content (values of keys) being same.
I clearlty see the need for property file refactoring plugin.