Meteor Showers Plug-in has english names for showers which starts with greek letters (δ-Leonids, etc), they are left untranslated while names with latin letters only are translated.
My QT version is 5.2 from Debian Sid.
Is this problem is reproducible on other systems?
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What exactly is the problem? Is official designations of meteor showers problem for you or I don't understand your message?
The problem is that some string are left untranslated. It may be QT bug (or feature) which may expect msgid to contain only us-ascii. So if QT really expects ascii-only string as their input Stellarium developers should replace greek letters in such strings with their names (Delta-Leonids, etc).