Add the 100% translated french locale.
- Mostly done by hand, with a pass of google translate .po kit to
translate the country languages and other simple strings.
- This includes a re-reading of previous translations, with a good
amount of typos now corrected.
I kept the previously used "blocs intelligents" translation for
"smartblocks", but in my opinion a better choice of words could be
found.
fixes#805
6383dfe442