added more translations
Add new Exception BadData

In the reference there are sometimes decay-lines that have instead of a
branching something like "seen", "dominate" or sometimes nothing at all.
This can be used to deal with these cases instead of a plain "not
found".
Search for all occurences of a decay

It may be possible that a decay is more than once listed in the
reference file. If that is the case, print a warning and take the one
whose branching fraction is closest to the one of the decay in the
source file.
Deal with an empty second column