Currently ProofreadPage extension works only in "Page:" prefix. May be nice if
that extension allow translated variants of that term.
Example of current code:
(works, but this is the main namespace)
(don't work and this is the namespace 106 recently created on bug 7521;
Portuguese Wikisource don't have plans to start using this feature, this has
been requested to get enabled only to be more easy to use it in the future; in
anothers words, this isn't a emergencial request :) )