WP-Members has been translated into a number of languages. This page will always have the most recent versions of any translation files that I have as well as the most recent POT. The most recent version number will be indicated. While there have been some changes along the way since 2.4, translation files should be fairly compatible with minimal changes.
If you need to update a file, I would suggest that you use Poedit.
If you are unfamiliar with localization, review this information at the Codex.
Most recent POT
WP-Members 2.7.5 by Dmitrii Krasnov
WP-Members by Outshine Solutions
WP-Members by B. Radenovich (Web Hosting Watch)
WP-Members 2.8 by Borisa Djuraskovic (Web Hosting Hub)
If you have created translations for WP-Members that you would like to share with the community, feel free to contact me via the contact page and I would be happy to add them here.
Note: if you are loading a translation on a site that has already had WP-Members installed, you’ll need to force the translated field names into the database. That process is described in this post.