allow es _source to be an attr instead of key
move esappserializer to webapps/serializers
fix ESTranslationSerializerField attr check
Revert "New region for testing purposes (bug 1040154)"

This reverts commit 082c3161756e6ae04894711abd4490d04a498af4.
Playing catch-up by excluding recently added regions (bug 1040154)
feed es view (bug 1036216)