All .po files are imported from translations folder

I see. Maybe you can prepare a patch to collect the file names first choosing only unique ones to import, not collecting file names for every module...

It would not be ideal still by the way, as we import all PO files under a module folder, even if those PO files belong to another module which happens to be in the same folder, but you don't enable them... Heh.

Anyway, let's fix the multiple import issue first and then get on to identifying PO files properly.

Drupal 6 does collect files as a unique list, and only imports them multiple times if you enable multiple modules in different HTTP requests from the same folder. Because Drupal 6 does not track whether a file was imported before or not. As autolocale is not in active development (D6 includes all the functionality), I am moving this issue to D7, because collecting the list of files would require serious API and DB changes, and this is still just a minor issue, nothing becomes broken, just the import takes a bit more time.

Marked http://drupal.org/node/148749 as duplicate and generalizing this issue a bit.

So the issue at hand is that when you have multiple .module files in the same folder, and .po files are imported for a module, all .po files are imported from the translations subfolder. So all disabled sister modules get their .po files imported and when you import more modules in succession, all make the same .po files imported multiple times.

I hope this becomes a smaller issue with Drupal 6, as it supports/encourages breaking modules into smaller files, so having more modules in the same folder becomes inconvenient anyway. Anyway, we can look into fixing this in Drupal 7 by looking at .po file name patterns.

Cleaning-up the "language system" issue queue as per http://cyrve.com/criticals.