%2$S: wildcard sources in ‘%1$S’ directives must include at least one non-generic sub-domain (e.g., *.example.com rather than *.com)
%2$S: rhaid i ffynonellau cerdyn gwyllt o fewn cyfarwyddeb '%1$S' gynnwys o leiaf un isbarth generig (e.e., *.example.com yn lle *.com)