more english translations + pictures added + completion of certain parts

user/English/social_actions.md

@@ -11,6 +11,8 @@ __note__: Social actions can only be created for **confirmed** trajectories.
 
 <!-- /fr/person/accompanying-period/{id}/work -->
 
+![social_action](/user/img/action_accompagnement.png)
+
 Similar to many other sections within the Chill application, a list of social support actions can be found by clicking on <**social support actions**> in the yellow side-menu of a trajectory.
 
 A concise overview of important information is given for each action in the list.
@@ -62,9 +64,10 @@ Concerned persons within the trajectory are listed here and the user can select
 
 ### Treating thirdparties
 
-TODO: what is the difference between these two?
+If an external partner executed the social action, they can be identified here.  
+Think of them as the main actor.
 
 ### Intervening thirdparties
 
-
+These are external partners that participate(d) in the social action, but are not the main actors.