@Toxophilite try to replace res_mods\0.7.9.1\gui\flash\ScoreTimer.swf with file from attachment, it should work for all languages for now.
ScoreTimer.swf
Hi. It's probably because of differences in "hold reward" string format. For most european laguages it looks like "+3 every 5 seconds" (you can find it on first tab of loading screen, see screenshot).
If you could send me your variant of this string (in text to copy-paste), i'll try to make fix for Korean language.