Since June 2020 we show the sentence "If you have any feedback for improving FileImporter, please leave a comment on its talk page". As said in T233290: Add help and request for feedback message the plan was to remove this sentence after a while. Two years should be more than enough.
- Remove the sentence from the extension's en.json.
- No change to qqq.json needed.
- Do not edit other languages. This will be done by the translatewiki community, e.g. https://translatewiki.net/wiki/MediaWiki:fileimporter-help-banner-text/de.