I would also be interested in this answer. Specifically, it is about strings in the Gutenberg editor, which apparently come from a Javascript file: wp-content/plugins/wp-last-modified-info/assets/block-editor/build/index.js
Hmm, my question doesn’t quite fit the topic of the original question. I will open a new thread.
@titecon Have you looked at the settings (“HTML Template …”)? There you can customize the output, see also screenshots like this in the plugin description.