Localization and quick fill

* Localize to six languages with help of [Transifiex](https://www.transifex.com/projects/p/wp-testing/)
* Add understandable labels for no-questions/no-answers and other no-something cases in test editor
* Quick fill questions from text
* Quick fill scores from questions separated by commas
* Update docs and add screenshots

git-svn-id: https://plugins.svn.wordpress.org/wp-testing/trunk@1026840 b8457f37-d9ea-0310-8a92-e5e31aec5664