add translations

Conflicts:
	Form/ActivityParametersType.php
	Resources/translations/platform.en.yml
	Resources/translations/platform.es.yml
	Resources/translations/platform.fr.yml
add missing properties + PHPDocs
Add migrations for new properties in ActivityParameters
add new fields in ActivityParameters form

Conflicts:
	Form/ActivityParametersType.php
Merge branch 'merge' of https://github.com/Elorfin/CoreBundle into activity-refactoring

Conflicts:
	Resources/translations/platform.en.yml
	Resources/translations/platform.es.yml
	Resources/translations/platform.fr.yml
Merge pull request #663 from kitan1982/activity-refactoring

Merge branch 'merge' of https://github.com/Elorfin/CoreBundle