Reduce revdelete-text-others verbosity

We're clearly only talking of the current wiki and tool, not aliens.
<https://www.mediawiki.org/wiki/Localisation#Avoid_.7B.7BSITENAME.7D.7D_in_messages>
<https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Revdelete-text-others/en>

Change-Id: I2af8ad9073809d4c9c5e6ec090eecbdb92e11310
Merge "Reduce revdelete-text-others verbosity"