Mark all languages fuzzy for a given term
If I update a term in my reference language I would like to be able to mark all other languages as fuzzy for that term to know what needs to be changed.

Marking strings as fuzzy in other languages when a string in the Default Reference Language is changed can be done in multiple ways, described here: https://poeditor.com/kb/how-to-keep-track-of-strings-changed-in-the-default-reference-language
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Upon import, you can mark as fuzzy the translations in all the other languages for the changed values. Then the contributors will be able to filter the fuzzy translations and update them as well. You have a short guide here: https://poeditor.com/kb/updating-translations-for-labels-based-projects
You can also do this manually in View or Add Terms, using the 'Set all translations as fuzzy' feature: https://poeditor.com/kb/view-or-add-terms