more strings to translate in utils also some fixes in defaults

also adds a changeable private member for document generation
This line caused the test to fail, but I have tested this and confirm that this is working. Any idea @MorrisJobke?

~~~
[apply] PHP Parse error:  syntax error, unexpected '[' in /var/lib/jenkins/jobs/pull-request-analyser/workspace@3/lib/private/defaults.php on line 36
~~~