While this translation is in a translation wiki page visible in the entire wiki, the translation cannot be overwritten in another translation wiki page.
It is new to me that it is a feature that any translation can be overridden by creating a new translation page. If this was the case, any translation that is defined in a wiki page would be a bug. I think when a translation is defined in a wiki page, the customization option would rather be to change that wiki page.
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