First things first. Your site is COOL! I've already added some Hebrew stuff (with my home account) and some ESL and Spanish stuff (from work).
The CSV text file export words well, however, rather than doing a download, could you just pop it out as simple text in a browser window. For Quizlet you do it as a copy/paste operation into their import function. It would be quicker and make less file clutter on my computer.
Export > copy > paste into Quizlet > import = DONE!
Just added a small “Export to Browser Tab” link under the “Export File” button.
Hope that helps make the process a little smoother!