diff --git a/src/constants/common.ts b/src/constants/common.ts
index 71c17696..c49fee4e 100644
--- a/src/constants/common.ts
+++ b/src/constants/common.ts
@@ -4,6 +4,7 @@ export const COMMON = {
   COOKIE_BANNER_DECLINE_BUTTON: 'COOKIE_BANNER_DECLINE_BUTTON',
   AVATAR_DEFAULT_ALT: 'AVATAR_DEFAULT_ALT',
   MEMBER_DEFAULT_NAME: 'MEMBER_DEFAULT_NAME',
+  UNKNOWN_DATE: 'UNKNOWN_DATE',
 
   CANCEL_BUTTON: 'CANCEL_BUTTON',
   SAVE_BUTTON: 'SAVE_BUTTON',
diff --git a/src/langs/de/common.json b/src/langs/de/common.json
index ddc58d95..6f883eb9 100644
--- a/src/langs/de/common.json
+++ b/src/langs/de/common.json
@@ -7,5 +7,6 @@
   "CANCEL_BUTTON": "Abbrechen",
   "CLOSE_BUTTON": "Schliessen",
   "AVATAR_DEFAULT_ALT": "Benutzerbild",
-  "MEMBER_DEFAULT_NAME": "Unbekannt"
+  "MEMBER_DEFAULT_NAME": "Unbekannt",
+  "UNKNOWN_DATE": "Unbekannt"
 }
diff --git a/src/langs/en/common.json b/src/langs/en/common.json
index c2c0206c..c2f7fba6 100644
--- a/src/langs/en/common.json
+++ b/src/langs/en/common.json
@@ -7,5 +7,6 @@
   "CANCEL_BUTTON": "Cancel",
   "CLOSE_BUTTON": "Close",
   "AVATAR_DEFAULT_ALT": "avatar",
-  "MEMBER_DEFAULT_NAME": "Unknown"
+  "MEMBER_DEFAULT_NAME": "Unknown",
+  "UNKNOWN_DATE": "Unknown"
 }
diff --git a/src/langs/fr/common.json b/src/langs/fr/common.json
index 844a8bb8..f505e387 100644
--- a/src/langs/fr/common.json
+++ b/src/langs/fr/common.json
@@ -7,5 +7,6 @@
   "CANCEL_BUTTON": "Annuler",
   "CLOSE_BUTTON": "Fermer",
   "AVATAR_DEFAULT_ALT": "avatar",
-  "MEMBER_DEFAULT_NAME": "Inconnu"
+  "MEMBER_DEFAULT_NAME": "Inconnu",
+  "UNKNOWN_DATE": "Inconnu"
 }