i15d/i18n Permalinks for WordPress.
WordPress is by default really restrictive on what characters you can use inside your permalinks.
i15d WP changes the WordPress behavior to be less restrictive with the characters, so that you can start using more characters (i.e. non-ASCII characters) on your permalinks without being truncated or deleted.
For just one simple reason: Characters Encodings (specially multi-byte character encodings).
So, even if the permalinks are similar but with different encoding, WordPress won't be able to process them equally and will, therefore, issue a 404 Not Found HTTP Error.
Fixing the encodings issue is a really complicated and time-consuming task but we will consider this issue in further versions.
This plugin was originally a custom software made for some webmasters of IDN Blogs and since maybe someone else might find it useful, I released this little work to the public :-P.
You can help us by finding and reporting bugs or well donating to the project by following Donate to this plugin link.