I'm not sure about this, so I'm posting it here. We have some tags that also have language tags. e.g: germany and german we also have a french tag. Should this kind of tagging be allowed? I do believe that a tag like latin and rome are ok, because latin is a way broader subject.
IMHO it should be Germany and German-Language, France and french-language, Rome and Latin-languange (this is the odd one, but it's best to keep the same pattern). You then have Spain and Spanish-language, etc.