PyCharm - Python - Error displayed right to the function '!invalid format: ...'
Answered
After I updated the 'PyCharm to version 2025, I get errors displayed near every function that looks like

I'm using a ‘French’ language pack. I did some research through Google Ai and it provided me with some answers but they didn't resolve the issue. I did reset the cache, restarted PyCharm and checked plug-ins without success.

I didn't try yet to uninstall the language pack.
I would like to have some advice first.
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Indeed, it might be related to a custom plugin. I would recommend disabling the french language pack and also any other ones that you may have enabled and restart the IDE;
In case the issue persists, please create a new bug report on Youtrack and make sure to provide the IDE logs from Help | Collect Logs and Diagnostic Data
I disabled the French pack, rebooted the IDE (as proposed) and the wrong messages disappeared. I have now the number of usages per function for most of them.
What do you recommend now if I want to have the IDE in french?
Did the error stop once you disabled it? In this scenario, we would recommend reporting to the plugin owner directly because as of now, it is still a feature request from our side: https://youtrack.jetbrains.com/issue/IJPL-162754/French-Language-pack-Support