Bump version
Merge branch 'develop' into hotfix/0.23.1
Update changelog and grammar version
Merge branch 'hotfix/0.23.1'
Merge tag '0.23.1' into develop

* Bug fixes:
  * [#288] Launching a begin/end questionnaire crashes
  * [#276] Fix back button behaviour in page activity
Code style
Merge branch 'develop' into feature/issue-274-questionnaireDesign
Remove useless xmlns