Fix PHP Notice in Translator class
Unit test for Translator with non-existant locale
Fix PHP Notice in Translator class
Fix PHP Notice in Translator class
Merge branch 'hotfix/4031'

Close #4031
Merge branch 'bugfix/translator' of git://github.com/xoob/zf2 into hotfix/4013
Merge branch 'hotfix/4013' into develop

Forward port #4013