There is a label in the stats dialogue which is not translatable (fixes #108).
Incidentally, how do you create and compile .po files for hamster?
Make GTK label translatable.
the specific label is not meant to be translatable as it is replaced by actual text. it's kept there just as a placeholder when working with the layout in glade.
as for creating the po files - the standard intltool- bits should work (it was so long ago that i've managed to forget, but essentially any loco guide of gnome should do the job)
Have a look at http://www.poedit.net (package should be in most distributions).