Update .travis.yml
Update .travis.yml

Try running build_lang.pl before running the test scripts to avoid lang.t failing with `Parse errors: No plan found in TAP output`.
openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server