Merge pull request #292 from waldo2188/master

Ajout de l'interface Serializable et des modifications dans les exemples...
Fixing typo
Fixing typos
Fix 4 typos (missing letter, added letter, missing point and one conjugation error)
Just cleaning some part of Chapter 18 and Chapter 23
Typo Fix

Changed : Dans cette section, vous apprendre comment créer[...]
To : Dans cette section, vous allez apprendre comment créer[...]
Merge pull request #293 from reynaldm/patch-1

Fix 4 typos (missing/added letter, missing point and conjugation error)
Merge pull request #295 from Gingonic/master

Typo Fix
Merge pull request #294 from jblondeau2/master

Just cleaning some part of Chapter 18 and Chapter 23
by default, locale is stored in request and not in session
Merge pull request #296 from arno14/patch-1

by default, locale is stored in request and not in session
Fix sample comment on the form documentation
Merge pull request #297 from gquemener/patch-2

Fix sample comment on the form documentation
Fixing some typo
Merge pull request #298 from jblondeau2/master

Fixing typo
Fixing typos
Fixing conf
Update Callback.rst
Very little typo
Merge pull request #300 from gquemener/patch-3

Fix translated callback "methods" parameter