Description: After clicking the Help button in the Grammar Cheking (Portuguese) tab of Language and Locales, the online documentation page opens with a 404 error instead of showing the expected help content. Steps to Reproduce: 1.Open LibreOffice Writer. 2.Go to Tools > Options > Language and Locales > Grammar Cheking (Portuguese) 3.Click the "Help" button at the bottom of the dialog. Actual Results: The Help button opens a browser window pointing to the official LibreOffice online help, but the page returns a 404 error (page not found). Expected Results: The Help button should open a relevant help page explaining the grammar checking options in this module, or at least redirect to the general Writing Aids or LanguageTool documentation without errors. Reproducible: Always User Profile Reset: Yes Additional Info: LibreOffice version: 25.8.3.2 Operating System: [Windows 11]. User interface language: Portuguese (Brazil). This is a legacy module (likely based on outdated LightProof or CoGrOO rules), superseded by the integrated LanguageTool. The contextual help link is broken/outdated. Similar issue reported for the English "English sentence checking" tab in bug #143754, but this is specific to the Portuguese localization. No crash occurs – just reduced usability when users seek help on writing aids.
Created attachment 204694 [details] Screen recording (animated GIF) demonstrating the bug Attached screen recording showing the error in action