The "%1$s" and "%2$s" syntax needs to be applied in the Korean and Japanese language files, isn't? So i think you can already apply this placeholders in the required translations. The other files use default argument order so don't needs more specific placeholders .
To demonstrate it i try to apply it via http://translate.dokuwiki.org/dokuwiki
Submitted at https://github.com/splitbrain/dokuwiki/pull/343/files
Can you update the other cases?