This feature was not maintained for a long time already, and would have required a lot of work to make it sensible and usable after 'recent' changes (like the move to weblate translation platform). For details see also https://devtalk.blender.org/t/ui-translation-tools-remove-edit-translation-feature-from-blender-ui-in-4-2lts-release/34947
Ref: !121825