first of all please let me say congratulations and thanks for this nice plugin. I was able to easily include it into my project.
The behaviour of closing the editor on the creation of a new properties file (for a new locale), however, caused my editor to reinitialize the resource bundle (delete and rewrite all files) as they come from a server :-)
This is why I had to extend the editor to add a new page and activate the I18nPage (first page) when a new file is created. I've seen that this was a TODO item anyhow, so I hope my changes can be for the benefit of the project and can be included into the codebase. I've attaced a patch for your review.