I fact, the translate tags were removed - that is why I am so puzzeled that the translation could be revived. In the Translate: page at least, I saw only the old units. I then assumed that units with numbers beyond those of the old page would be lost to translations.
Btw Yurchor thinks that we may have the same problem with other pages! See User_talk:Yurchor#The_ToolBox_page_1212.