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On English Wikipedia (MW 1.20wmf11 (da7b5b1)) The text of [[MediaWiki:Expand templates title]] is defined as
"Context title, for {{FULLPAGENAME}} etc.:"
and was not changed recently.

Nonetheless, the parser behavior changed and instead of displaying that text as is, it displays
"Context title, for Special:ExpandTemplates etc.:"
on [[Special:ExpandTemplates]].

On Portuguese Wikipedia (also MW 1.20wmf11 (da7b5b1)), we have [[MediaWiki:Expand templates title/pt-br]] defined as
"Título de contexto para <nowiki>{{</nowiki>FULLPAGENAME}} etc.:"
and this is exactly what appears at
https://pt.wikipedia.org/wiki/Special:ExpandTemplates?uselang=pt-br