Minor fixes for closing accompanying course:

* check that transition can be applyied in menu;
* change organisation for activityVoter, and check for authorization in
    Activity Controller
* fix label 'create' in accompanying course document
* minor fix in accompanying course document voter
* change color when course is closed and show old user, and startdate /
    enddate

src/Bundle/ChillDocStoreBundle/Resources/views/AccompanyingCourseDocument/index.html.twig

@@ -62,7 +62,7 @@
 		<ul class="record_actions">
 			<li class="create">
 				<a href="{{ path('accompanying_course_document_new', {'course': accompanyingCourse.id}) }}" class="btn btn-create">
-					{{ 'Create new document' | trans }}
+					{{ 'Create'|trans }}
 				</a>
 			</li>
 		</ul>