You put it in place using the instructions provided; ie you need to create a KoboRoot.tgz file that contains usr/local/Kobo/hyphenDicts/hyph_FR.dic then copy that file to .kobo on your device and allow it be processed.
If you want to revert, either reinstall the same version of firmware as you had manually, or, make a new KoboRoot.tgz that just contains the original hyph_FR.dic that you can obtain by downloading the firmware for your device and extracting that file from it.
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