Add translation for mass sharing of public object data

frontend/tr/institution.json

@@ -60,6 +60,11 @@
         "museum_shop": "Museumsshop",
         "babycare_room": "Wickelraum",
         "ticket_prices": "Eintrittspreise",
-        "online_visitor_statistics": "Visitor statistics"
+        "online_visitor_statistics": "Visitor statistics",
+        "institution_share": "Public shares",
+        "institution_share_introduction": "Here you can download XML dumps of the public data of the museum.",
+        "summary": "Summary",
+        "format": "Format",
+        "last_generated": "Last generated"
     }
 }