csp: allow multiple lines and add presets

dashboard/public/translation/nl.json

@@ -34,7 +34,6 @@
         "displayName": "Weergavenaam",
         "actions": "Acties",
         "table": {
-            "date": "Datum",
             "version": "Versie"
         },
         "action": {
@@ -827,7 +826,6 @@
             },
             "robots": {
                 "title": "Robots.txt",
-                "disableIndexingAction": "Indexering uitschakelen",
                 "description": "Standaard kunnen bots deze app indexeren."
             },
             "hstsPreload": "Schakel HSTS-preload in (inclusief subdomeinen)"