Unused property in strings warning, after "Clean Code" code changes

IntelliJ Community Edition, 2016.3.3

I have tried to internationalize my project with the properties. I have created some property files and have used the properties in the string.

After I have reverted the changes using the property files, my code now shows for the earlier replaced strings the "unused warning" (corrected_string.png) and if I use the Clean Code function (after_clean_code.png), the IDE automatically adds the "=" character instead of the space.

Did I forgot something to delete or update?

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