[Zanata] Prettyfying locales json files

In order to compare actual json files to zanata-backed files, we need to
sort the keys and have a 3-spaces indent.

This is done with jq:

cd locale/
mkdir tmp/
for i in *.json; do jq --indent 3 -S -M '.' < $i > tmp/$i ; done
mv tmp/* .
rmdir tmp