* Add a timeout to the question.

* Add translation keys.
* Add styling in flamingo and remove it from templates.
* Fix coding style issues.

* Introduce the event DocumentsDeletingEvent.
* Rename AbstractCheckBrokenExtensionJob to AbstractEntityJobWithChecks.
* Make AbstractEntityJobWithChecks send a DocumentsDeletingEvent which is cancelable.
* Introduce DocumentsDeletingListener in the xwiki-platform-extension-handler-xar module which is a better location.

XWIKI-13338: Add ability to override the character symbols used to represent an Entity Reference as a string
* Fix some use cases using DefaultStringEntityReferenceSerializer as a POJO instead of a component (we'll need to fix this to allow overiding DefaultScheme)
* Added some classes forgotten in the previous commit

XWIKI-13292: Provide a test module to use as dependency for the module manipulating oldcore test tools