feat(server/interface): configurable txAdmin notifications override (#299)

locales/nl.json

@@ -5,5 +5,10 @@
     "close": "Sluiten",
     "confirm": "Bevestig",
     "more": "More..."
-  }
+  },
+  "txadmin_announcement": "Server announcement by %s",
+  "txadmin_dm": "Direct Message from %s",
+  "txadmin_warn": "You have been warned by %s",
+  "txadmin_warn_content": "%s  \nAction ID: %s",
+  "txadmin_scheduledrestart": "Scheduled Restart"
 }