Hi @Jony , sorry for the long delay in answering.

I tried connecting WPCleaner to bnwiki with WPCleaner in English, and here are a few things I noticed.

Project check Wikipedia :

• In WikiCleanerConfiguration page, I see check_wiki_translation_page=Wikipedia:WikiProjekt Check Wikipedia/Translation END
• Page Wikipedia:WikiProjekt Check Wikipedia/Translation doesn't exist. WPCleaner doesn't find any configuration for CheckWiki, so no errors are activated.
• The correct page seems to be Wikipedia:WikiProject Check Wikipedia/Translation
• After fixing the configuration, I see errors in Project check Wikipedia and I can load them

Interface language :

• I see many texts as rectangular boxes, it's generally that the font used doesn't support the characters (see this question for example)
• I'm not familiar with Bengali language, do you know which font can correctly display the characters ?
• If you know some, can you tell me which ones and also try them with WPCleaner (in Options / Formatting / Select editor font name, apply and then restart) : is there any improvement ? It should be only on the editing area, not the rest of WPCleaner, but if it works, maybe I can do something

Automatic fixing button :

• After fixing the configuration for Check Wikipedia, I managed to load a list of pages in the Check Wiki window
• I selected a dozen of them and clicked on the Automatic fixing button
• The Automatic fixing button opened a new window
• This window seems to work

Bot tools :

• It's related a lot to Check Wikipedia
• I tried after fixing the configuration, it seems to work