Fix whitespace in parserTests.js; run roundtrip-tests.js in 'en' by default.

We need to default to 'en' for roundtrip-tests.js or else jenkins jobs
will fail when we add new image tests.

Change-Id: If106d5e8ff01c11c81990120977bf48ab4405413
Merge "Fix whitespace in parserTests.js; run roundtrip-tests.js in 'en' by default."