That was helpful. It seems this problem is probably limited to the el_GR utf-8 locale. In the log file I see it grep for the menu item for configuring the MTA, and somehow it fails to find the greek translation in the menu mapping file. It could be some 8-bit cleanness issue corrupting the string as it goes around in base-config.
I am not able to reproduce it locally. I'll try on a fresh install. Failing anything else, we could probably remove the translation of that menu item, but I'd like to track down the real bug. -- see shy jo
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