On a multilingual site where the base language is Dutch, the English and French pages are produced automatically from two inputs.
Where to edit. You edit the base-language (Dutch) text in the site editor. You edit your per-language property descriptions in your PMS. For Guesty, this means updating the Marketing Fields for each language.
Changing a specific sentence. If a specific English or French sentence should read differently than the automatic version, send support the exact wording you want. Support can pin it so it always displays that way.