Fixed couple typos
Update Resources/doc/index.md
Merge pull request #896 from javiacei/patch-2

Update Resources/doc/index.md
Replaced occurrences of separate MinLength/MaxLength rules with Length validation rule.
Update Resources/translations/validators.it.yml

Added translation for the missing key "mismatch"
Merge pull request #902 from hpatoio/patch-1

Update Resources/translations/validators.it.yml
Corrected mistakes in last commit.
Committed changes to incorrect language keys in Group validation
password.mismatch
Merge pull request #904 from Hast/translation

password.mismatch for russian translation

Closes #903
Add missing Dutch translations
Merge pull request #906 from aderuwe/nl-translation

Add missing Dutch translations
Better consistency with symfony translations files.
Merge pull request #908 from empire/rename-translations-files

Translation: Better consistency with symfony translations files.
Removed trailing whitespaces
Merge pull request #901 from iainsaxon/deprecated-validation-rules

Removed deprecated MinLength/MaxLength validation rules
Updated the changelog
Refactored the Registration controller

The controller now handles the form itself and dispatches several events
during the workflow.
Added an event to allow modifying the default values of the user
Added an event before confirming the account