Thread:Support/About Special:AdvancedTranslate/reply

You can choose to use an underscore.

They'll most probably only be updated when a new MediaWiki version is deployed (so changes made now, will be in MediaWiki 1.20).

If you remove previous versions, which can only be done if they exist, YOU SHOULD SERIOUSLY CONSIDER IF THEY ACTUALLY NEED CHANGING. If you change them, all old possibilities should remain for backwards compatibility. When in doubt, do not change or translate, but discuss with your community. Changing special page names and magic words often (as well as namespace names), creates a huge mess.