Thread:Support/About http://translatewiki.net/w/i.php?title=MediaWiki:Logentry-groupreview-message/en

I don't understand what the parameter $3 stands for. According to the qqq text parameters $1, $2 and $3 have 2 meanings each. Which meaning the parameter $3 has in this messge? It seems it may be a numerical variable for the number of translations. But this meaning is not mentioned in the qqq text. And if so, plural statement should be used.