Fill out substitutions-list's query-schema

aleksis/apps/chronos/frontend/components/substitutions.graphql

 query substitutionsForDate ($date: Date!) {
   substitutionsForDate(date: $date) {
     affectedTeachers {
+      shortName
+      fullName
     }
     affectedGroups {
+      shortName
     }
     substitutions {
       groups {
+        shortName
       }
       period {
-      
+        startSlot
+        endSlot
+        startTime
+        endTime
+        wholeDay
       }
       teachers {
+        shortName
+        fullName
       }
-      subject {
-      }
+      subject
       rooms {
+        shortName
+        name
       }
-      badge {
-      }
-      comment {
-      }
+      cancelled
+      comment
     }
   }
 }
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