feat(certificates): form for graduation certif.

certificates.yaml

@@ -426,6 +426,24 @@ nodes:
         viewers: *view-minimal
         source: "antrag eingereicht, studienabschluss"
         form:
+          "studienabschlussbescheinigung":
+            - "1":
+                tag: file
+                label:
+                  fallback: "Bescheinigung"
+                  fallback-lang: de-de-formal
+                  translations:
+                    en-eu: "Certificate"
+                default: null
+                optional: false
+                config:
+                  unpack-zips:
+                    default: true
+                    force: true
+                  multiple: true
+                  all-empty-ok: false
+                  max-file-size: 5242880
+                  restrict-extensions: ["pdf"]            
           "kommunikation":
             - "4": *kommunikation-field-optional