Hi Ă–mer, Cyril I'm trying a build on a buster machine and cannot reproduce the issue, but I have changed the locale in /turkish/.wmlrc to tr_TR.UTF-8 anyway, since it seems it causes no problem, and the rest of languages also use xx_XX.UTF-8 locales.
I'm closing this bug now, feel free to reopen or open another bug when the www-master.debian.org machine is upgraded to buster, if you notice any issue with the encondings. Thanks all! Kind regards, -- Laura Arjona Reina https://wiki.debian.org/LauraArjona