[FrameworkBundle] Added creation of folder translation if it does not exist

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

Before:
![capture d ecran 2014-12-16 a 23 05 45](https://cloud.githubusercontent.com/assets/667519/5462985/183c69b2-8579-11e4-995c-a1661f6dbb2e.png)
---------------------------------------
After:
![capture d ecran 2014-12-16 a 23 09 09](https://cloud.githubusercontent.com/assets/667519/5462988/1bcc81b6-8579-11e4-9651-7aed0a6fec58.png)


If this is just for being able to load translations, I would not create the dir, just bypass it. Is it possible?