Special:AdvancedTranslate and normalised form
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Fragment of a discussion from Support/LiquidThreads
Worth testing, but bugzilla I think: most likely, the case normalisation to the canonical form will happen in any case even if you add case-differing localised names.
... which would be a bug. Indeed, worth to be sent to bugzilla, if so. Localized versions should have preceedence, even if they coincide with genuine ones.
Now at bugzilla:62372. Please add any clarifications/comments there.
Lokal_Profil (talk)
Also related to Special:AdvancedTranslate:
bugzilla:62375: Allow translation of (non-core) namespaces through AdvancedTranslate
Lokal_Profil (talk)