[WCM][Translation] added logging capability.

| Q             | A
| ------------- | ---
| Doc fix?	 | no
| New docs? | yes(symfony/symfony/pull/10887)
| Applies to | 2.6+
|Fixed tickets |	-
	
I would move the ``versionadded`` directive below the following headline. Otherwise, people might miss it when they directly jump to this specific section (it's then out of their view port).