@Janbery: Ahoj, your task description above shows � (a square with a question mark in it). Is that really intentionally the character that you were looking for? Just trying to make sure this is not a browser issue on your side. Note that there is no such page either for that character: https://cs.wikipedia.org/wiki/%EF%BF%BD , so I do not see any bug in CopyPatrol here but expected and correct behavior...

@Aklapper: Ahoj, I mean when is in article title diacritics, for example "í". It looks like this:

Ah, thanks! Sorry, I misunderstood. I can confirm the problem.

It looks like the incorrect page title is in the EranBot database:

MariaDB [s51306__copyright_p]> select page_title from copyright_diffs where page_title like 'Usne%';
+-------------------------+
| page_title              |
+-------------------------+
| Usnesen�_zastupitelstva  |
+-------------------------+
1 row in set (0.06 sec)

Any news for this problem?

It might be a simple issue of changing the db charset, or adding a SET NAMES to the client.

It affects overall, not only Czech Wikipedia.

I think the character set on the database is fine. I manually updated a row to use the right character and it stored properly. Example: https://copypatrol.toolforge.org/fr/?id=64032167

So the issue must be with the EranBot code.