Thread:Support/Special:AdvancedTranslate and normalised form

I tried adding the Swedish translation "Prefixindex" to the special page "PrefixIndex" which gave me the following message
 * Translation Prefixindex for Prefixindex is not in normalised form, which is PrefixIndex

Since Prefixindex is one word in Swedish PrefixIndex would actually be incorrect yet there seems like this is not possible to fix.

Now Special:Prefixindex will still work but the incorrect capitalisation shows up on e.g. Special:Specialpages on e.g. sv.wp.

Is there a work around for this or something which should be sent on to bugzilla?