Please see bug 1334960 and bug 1364114. There is a typo in newt/po/lt.po (Lithuanian translation): "Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && (n%100<10 or n%100>=20) should be ("or" is considered to be an identifier by gettext): "Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && (n%100<10 || n%100>=20) Please fix Plural-Forms headers (s/or/||/).
Should be fixed in upstream git now. Thanks!
Unfortunately it is still not fixed in newt-0.52.20-14.fc30.
The new upstream release is now in Fedora.