apply non-multilang to all phpcr-odm documents regardless of implemented interface

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | not really
| Deprecations? | no
| Tests pass?   | travis
| Fixed tickets | https://github.com/symfony-cmf/SeoBundle/issues/161
| License       | MIT
| Doc PR        | - (its already claiming things work as this PR will make them work)