Fixed bug #1153 (and duplicate #1150).

I have fixed the bugs 1153 and 1150 (duplicates) that I originally
introduced a long time ago. Retained (read) handling of legacy setting
containing the problematic '@'. To get rid of the setting containing
'@', users must manually remove this line from their database file. The
latter is not a bug but an intended feature.
Updated Danish translation (+ minor glitch in Norwegian)

I quickly updated the existing Norwegian strings to the Danish
translation. The Danish translation is not yet complete.