diff --git a/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java b/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java
index 75aca937..f5919e88 100644
--- a/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java
+++ b/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java
@@ -3,6 +3,8 @@ package de.srsoftware.umbrella.messagebus;
 
 import de.srsoftware.umbrella.messagebus.events.Event;
 import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 public class MessageBus {
@@ -15,7 +17,7 @@ public class MessageBus {
 		new Thread(() -> { // TODO: use thread pool
 			try {
 				Thread.sleep(100);
-				listeners.parallelStream().forEach(l -> l.onEvent(event));
+				List.copyOf(listeners).parallelStream().forEach(l -> l.onEvent(event));
 			} catch (InterruptedException ignored) {
 			}
 		}).start();
diff --git a/translations/src/main/resources/de.json b/translations/src/main/resources/de.json
index a7522f55..0f5143e0 100644
--- a/translations/src/main/resources/de.json
+++ b/translations/src/main/resources/de.json
@@ -176,6 +176,7 @@
   "impersonate": "zu Nutzer wechseln",
   "IMPERSONATE": "Nutzer wechseln",
   "index_page": "Aufgabenübersicht",
+  "initiator": "Initiator",
   "instantly": "sofort",
   "invert_filter": "Filter umkehren",
   "invoice": "Rechnung",
@@ -378,6 +379,7 @@
   "The wiki page '{page}' has been deleted by {user}": "Die Wiki-Seite „{page}“ wurde durch {user} gelöscht.",
   "time ({id})": "Zeit ({id})",
   "times": "Zeiten",
+  "timestamp": "Zeitstempel",
   "timetracking": "Zeiterfassung",
   "title_not_available": "„{title}“ ist als Seitenname nicht mehr verfügbar!",
   "title_or_desc": "Titel/Beschreibung",
diff --git a/translations/src/main/resources/en.json b/translations/src/main/resources/en.json
index fb4fdd89..b743ba9c 100644
--- a/translations/src/main/resources/en.json
+++ b/translations/src/main/resources/en.json
@@ -176,6 +176,7 @@
   "impersonate": "impersonate",
   "IMPERSONATE": "impersonate",
   "index_page": "task overview",
+  "initiator": "initiator",
   "instantly": "instantly",
   "invert_filter": "Filter umkehren",
   "invoice": "invoice",
@@ -378,6 +379,7 @@
   "The wiki page '{page}' has been deleted by {user}": "The wiki page '{page}' has been deleted by {user}",
   "time ({id})": "time ({id})",
   "times": "times",
+  "timestamp": "timestamp",
   "timetracking": "time tracking",
   "title_not_available": "„{title}“ is not available as page name!",
   "title_or_desc": "title/description",