if you mean
KisnameServer("layer %1",1)
{
return i18n(string).arg(num)
}
then ok

No, this is not translatable because "layer %1" would not be added to the dictionary.

but if you mean
KisNameServer(i18n("layer")),1)
{
return string + string(num)
}

then no

Right that would be wrong too.

I commited in revision 606838, the nameserver now provides only a unique number like i18n("foo %1", nameserver->number())
Maybe it's wrong to call it "nameserver" then.