https://multiplefilemaker.com/
mass replace text in multiple files
mass replace text in multiple files

How do I find and replace in a folder?

Solutions
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DB Maker
Extract data from text, html, xml and other files.
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Miltiple HTML file generator
Using just one csv-file with a database, you can create thousands of HTML pages.
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Multiple File Search and Replace
Edit, find and replace text in multiple files.
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Website Extractor
The program can download up to 100 files at a time
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mass replace text in multiple files
How do I find and replace in a folder?

The Find and Replace tool has options to simply search for strings inside files, ... also easy to use even for replacing several phrases across multiple text files.