You want the last one. You need to extend your current plugboard for the title to add the language. That code should give you something like:
Quote:
The Dresden Files - 01 - Storm Front - eng
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If you want to check, calibre has a template tester. You add it to the toolbar, select a book and the tester. Then enter the template and the result will be shown for the book. That will let you see what you get and adjust it as you like.