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

Close #4013
Implement better text domain merging support
Merge branch 'hotfix/4053'
Close #4053
* hotfix/4053:
  Implement better text domain merging support