language-env: should configure UTF-8 for french (and most other languages?)

[Frank Lin PIAT <fpiat@klabs.be>]

retitle 410200 language-env: should use UTF-8 encoding for french
severity 410200 important
merge 410612 410200
thanks

<note>
I  am CC'ing debian-i18n, in case some people speaking those languages
can check appropriate files in /usr/share/language-env/support.*.pl

Bielaruskaja, Bulgarian, Catalan, Dansk, Deutsch, Espanol, Francais, 
Nihongo, Hangul, Lietuviu, Makedonski, Polski, Russkii, Srpski, 
Thai, Turkce, Ukrajins'ka
</note>

Hi,

I just discovered this great tool.

I am merging the bugs #410200 and #410612. The encoding should be UTF-8
for French (and most language except Japan and a few others), AFAIK.

Thanks,

Franklin