can we use new string formatting using .format() method?
moin stil uses "%s %d" % (foo, bar) style string formatting.
some work has already been done on replacing this with .format() new style formatting, but it is not completed yet.
especially, a lot of translatable strings still use old %-style.
maybe this is related to the _() method there, this should be checked (and whether we can / should use .format() there.
this needs to be done before doing translations, because change of original english strings would make the translated string invalid.
if we decide on using some other formatting method than now, the respective refactoring should be done globally in the source.