feat: add certification thing

test/resources/indexable/AcademicEvent.3.json

@@ -5,18 +5,14 @@
     "description": "Die Übung hat 2 SWS und wird auf 2 Gruppen verteilt.",
     "uid": "7e2b64b0-925d-5f63-b464-a6e3e9492411",
     "name": "Algebra II",
-    "categories": [
-      "tutorial"
-    ],
+    "categories": ["tutorial"],
     "academicTerms": [
       {
         "uid": "aacd5611-b5be-54ce-b39f-c52f7e9a631d",
         "type": "semester",
         "name": "Sommersemester 2018",
         "acronym": "SS 2018",
-        "alternateNames": [
-          "SoSe 2018"
-        ],
+        "alternateNames": ["SoSe 2018"],
         "startDate": "2018-04-01",
         "endDate": "2018-09-30",
         "eventsStartDate": "2018-04-09",
@@ -46,9 +42,7 @@
         "uid": "6c259ad8-99af-5ea2-8aae-a3c9027d26e2",
         "type": "catalog",
         "level": 3,
-        "categories": [
-          "university events"
-        ],
+        "categories": ["university events"],
         "name": "Mathematik: Grundstudiums-Veranstaltungen (Diplom, Bachelor)"
       },
       {
@@ -56,9 +50,7 @@
         "type": "catalog",
         "level": 3,
         "description": "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.",
-        "categories": [
-          "university events"
-        ],
+        "categories": ["university events"],
         "name": "Mathematik: Lehrveranstaltungen für andere Fachrichtungen (Service)"
       }
     ],