add customizable "cancel" button

[kspychala-as]

Hi! It will be good to have customizable cancel button, because now I can't event change label, so I'm stuck with english "cancel".

Best regards!

[roedll]

This should be possible (at least with the current implementation on master):

Just override/translate the values originally defined in /survey/src/main/res/values/strings.xml in your own strings.xml