Merge pull request #455 from symfony-fr/2.4

Merging 2.4
fix typo
Missing translation for ParamConverter
Update forms.rst : Fix typo by removing an useless quote
Update validation.srt : Fix bad import in exemple
Update service_container.rst : Fix typo
Update use_virtuals_forms.rst

getDefaultOptions() method has been removed from FormTypeInterface in 2.3 and should be replaced by setDefaultOptions(OptionsResolverInterface $resolver). (information given in UPGRADE-2.1.md)
Merge branch 'jcrombez-patch-1' into 2.3
Merge branch 'cyrilchandelier-patch-1' into 2.3
Merge pull request #459 from Deuzu/patch-2

Update forms.rst : Fix typo by removing an useless quote
Merge pull request #460 from Deuzu/patch-3

Update validation.srt : Fix bad import in exemple
Merge pull request #461 from Deuzu/patch-6

Update service_container.rst : Fix typo
Merge pull request #464 from symfony-fr/2.3

Merging 2.3 in 2.4