[Bug fortran/79602] translation: globally replace '%s' with %qs

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79602

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Patch posted at https://gcc.gnu.org/ml/fortran/2017-03/msg00086.html.