Add Symfony 4.3 kernel.locale_aware tag (lexik#347)

Symfony 4.3 does not use the TranslatorListener anymore to set the locale. Instead, the LocaleAwareListener is used to collect locale aware services

Sf4 fix (lexik#331)

* Use correct new symfony 4 translations directory

* Import command new sf4 directory structure

* Create translations cache dir

🐛 Fix render twig in controller for overriding purpose (lexik#311)

Fix BC with Symfony 2.8 LTS (lexik#322)

* If the container has the parameter project_dir use that one, otherwise
use the root_dir

* Use the Kernel Version ID instead

add sf4 support (lexik#320)

Added modified flag in order to fix merge algorithm (lexik#261)

Renamed property

Added modifiedManually property mapping for Propel and Document

Code style fix

Corrected ExportTranslationsCommand service id. (lexik#314)

 lexik#306. set public of 'translate' alias for compatibility with ot…

…her components in SF4. (lexik#309)

URL decode updated translation messages

Since PR lexik#72, all translation updates are sent URL-encoded to the
backend. To allow spaces and markup in translated messages the
datagrid handler must decode the messages before saving them.

Fixes issue lexik#286