Sorry to hear about your issues. There's supposed to be a message that appears when you get a new email, and there certainly aren't supposed to be any 'undefineds' floating around!
My best guess is this was caused by loading a save file from before the translation update into the new version. I tried to make the new version backwards compatible but maybe it didn't work here for some reason.
If anyone else experiences this, try using the 'language' command and then selecting which language you want. This should re-update all the translatable UI elements.