Rename existing old uploaded images containing accented French characters (not during upload)

Well all depends und your use case – can the renaming be done in bulk using regex? then go and apply the same regex to the Database, by e.g using http://wp-cli.org/commands/search-replace/

If you need to do it manually maybe take a look at https://wordpress.org/plugins/media-file-renamer/

Good Luck!

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