Notification of string changes

Author: Huong Nguyen
MDL-74996 Quiz: Change the submission confirmation dialogue content
- Changed the title from "Confirm" to "Submit all your answers and finish?"
- Changed the content from "Once you submit, you will no longer be able to change your answers for this attempt."
to "You will no longer be able to change your answers for this attempt."
- Changed some Behat scenarios to match with the new dialogue content


http://git.moodle.org/gw?p=moodle.git;a=commit;h=d4d666cdf49d8a2a92b65df2338f4327ace4d3ee
http://github.com/moodle/moodle/commit/d4d666cdf49d8a2a92b65df2338f4327ace4d3ee

+ 4.1 en [confirmclose,mod_quiz]
+ 4.1 en [submission_confirmation,mod_quiz]