The world types that appear in the "Changes from last backup" screen in Realms are not translatable. These appear after replacing the active world with an experience/inspiration/adventure map/template, waiting for Realms to create a backup, and then checking the "Changes from last backup" screen.
It seems there are 4 possible strings:
ADVENTUREMAP
EXPERIENCE
INSPIRATION
NORMAL
The language in the attached screenshots is set to Italian, which has been 100% translated on Crowdin. The above strings are missing from the language files and thus are untranslatable.
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Isn't this a duplicate of MC-18060?