The UnleashIt tool deploys any file type that is registered for deployment. By default, in my installation, .resx is already registered. In my instructions on this page, I only mention the file masks you should add in addition to defaults, but I don't mention .aspx .resx etc because those are included by default.
Look in the list of file maps in your screen, is *.resx there as it should be?
If so then the problem is more likely one of file permissions or file timestamps. If you think a specific file is missing, look in the Web/App_GloablResources folder of your source code, what is the last modified time of the file there? Then check if the file exists in the deployment target folder under App_GlobalResources. If an old copy is somehow there with a newer timestamp it will not be deployed, or if the one in there soemhow got funky permissions on it it can't be overwritten. In either case just delete the older file and deploy again.
Hope it helps,