Fix glossaire (missing folders) and setup (stats files)

**glossaire.sh**
If a folder is missing, all next locales won’t be updated because we’re
in the wrong folder

**setup.sh**
Needs an absolute path for the .json files. Also switch to array
instead of having two identical pieces of code
Merge pull request #351 from flodolo/glossaire_missingfolders

Fix glossaire (missing folders) and setup (stats files)