Update TranslationWalker.php

MySQL cats fix for issues: 
https://github.com/Atlantic18/DoctrineExtensions/issues/1011
https://github.com/Atlantic18/DoctrineExtensions/issues/1024
Update TranslationWalker.php

fixed condidtion
Update PersonalTranslationTest.php

updated test after MySQL cast fix
Revert "Update PersonalTranslationTest.php"

This reverts commit e5f5b4c80ec936ddd36c08c9ce1d0309c25caaf1.
Merge pull request #1025 from birko/patch-1

Update TranslationWalker.php