Follow https://translatewiki.net/wiki/How_to_drop_a_project unless progress is made on T388692: MismatchFinder does not get translation updates.

Steps:

• Inform the maintainers - T388692

Update in the translatewiki repo:

• Remove from repoconfig.yaml
• Remove from TranslateSettings.php (keep namespace!)
• Remove group yaml and associated validators if any
• Remove from aggregate groups if any

Update in the wiki:

• Remove from Group descriptions - https://translatewiki.net/wiki/Group_descriptions#Wikimedia_multimedia_conversion_tools
• Update Translating:Wikidata Mismatch Finder to say it is discontinued by adding {{Discontinued project}} on top of the page and set former=1 for the [ ] project activity template. - https://translatewiki.net/wiki/Translating:Wikidata_Mismatch_Finder
• Update Category:Wikidata_Mismatch_Finder to change category from Category:Supported projects to Category:Formerly supported projects - https://translatewiki.net/wiki/Category:Formerly_supported_projects
• Mention the removal in News - https://translatewiki.net/wiki/Project:News
• Update Template:User_Wikidata_Mismatch_Finder to say "helped translating" instead of "helps translating" - https://translatewiki.net/wiki/Template:User_Wikidata_Mismatch_Finder
• Update Category:Wikidata_Mismatch_Finder translators to change category from Category:Users by project to Category:Users by former project - https://translatewiki.net/wiki/Category:Users_by_former_project
• Update Category:Support requests for Mismatch Finder to change category from Category:Support requests to Category:Support requests for formerly supported projects - https://translatewiki.net/wiki/Category:Support_requests_for_formerly_supported_projects - (This category currently contains no pages or media.)