As russian user of tk toolkit, I feel much concern about i18n issues of tk. In my homepage [L1 ] there's a couple of my patches, that make tk more i18n-aware (e.g. in $canvas postscript output). I'm going to keep my page up-to-date, so any non-ascii-non-latin1 user can always find there nessesary fixes, both for cvs head and for last stable version.
Current i18n status/problems I know about: