About [[MediaWiki:Newmessagesdifflinkplural/en]]

CLOSED This issue is closed by Nike

Documented.

Why isn't $1 displayed (like last $1 {{PLURAL:$1|change|changes}})? It's already done in some languages.

Ignorance is bliss.

then what about rollbacklinkcount ("rollback $1 {{PLURAL:$1|edit|edits}}")?

or should I kill explicit $1 in some languages to keep them always a translated version of en?

Explicit $1 is deviation from the source text which we do not recommend.