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