If you enable the translation_entity module, go to admin/config/regional/content-language, and check all of the boxes there you'll get the following two errors:
At least one field needs to be translatable to enable Website feedback for translation.
At least one field needs to be translatable to enable Tags for translation.Tags and Contact categories do at least have a "title" field, so I'm not sure what it's barking about (I guess because they're not "real" fields), but in any case it seems like we should not be offering people options here that they cannot actually use.