Fix mistake in translation's service definition.
bug #9537 [FrameworkBundle] Fix mistake in translation's service definition. (phpmike)

This PR was submitted for the 2.3 branch but it was merged into the 2.2 branch instead (closes #9537).

Discussion
----------

[FrameworkBundle] Fix mistake in translation's service definition.

Wrong class parameter fixed.

Commits
-------

b542e84 [FrameworkBundle] Fix mistake in translation's service definition.