diff --git a/interface/src/i18n/de/index.ts b/interface/src/i18n/de/index.ts
index 011ca2b14..24261aaf1 100644
--- a/interface/src/i18n/de/index.ts
+++ b/interface/src/i18n/de/index.ts
@@ -231,7 +231,7 @@ const de: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Client',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Optional',
+  OPTIONAL: 'Optional', // TODO translate
   FORMATTING: 'Formattierung',
   MQTT_FORMAT: 'Topic/Payload Format',
   MQTT_NEST_1: 'Eingebettet in einem Gesamttopic',
diff --git a/interface/src/i18n/en/index.ts b/interface/src/i18n/en/index.ts
index 61a14cf1e..d8edb747e 100644
--- a/interface/src/i18n/en/index.ts
+++ b/interface/src/i18n/en/index.ts
@@ -231,7 +231,7 @@ const en: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Client',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Optional',
+  OPTIONAL: 'optional',
   FORMATTING: 'Formatting',
   MQTT_FORMAT: 'Topic/Payload Format',
   MQTT_NEST_1: 'Nested in a single topic',
diff --git a/interface/src/i18n/fr/index.ts b/interface/src/i18n/fr/index.ts
index 69784aadd..f2b065463 100644
--- a/interface/src/i18n/fr/index.ts
+++ b/interface/src/i18n/fr/index.ts
@@ -231,7 +231,7 @@ const fr: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Client',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Optionnel',
+  OPTIONAL: 'optionnel',
   FORMATTING: 'Mise en forme',
   MQTT_FORMAT: 'Format du Topic/Payload',
   MQTT_NEST_1: 'Englobé dans un topic unique',
diff --git a/interface/src/i18n/it/index.ts b/interface/src/i18n/it/index.ts
index 6a1a433f2..026d00305 100644
--- a/interface/src/i18n/it/index.ts
+++ b/interface/src/i18n/it/index.ts
@@ -233,7 +233,7 @@ const it: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Cliente',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Opzionale',
+  OPTIONAL: 'opzionale',
   FORMATTING: 'Formattazione',
   MQTT_FORMAT: 'Formato Topic/Payload ',
   MQTT_NEST_1: 'Inserito in un singolo argomento',
diff --git a/interface/src/i18n/nl/index.ts b/interface/src/i18n/nl/index.ts
index 3007ba17b..eb17d20af 100644
--- a/interface/src/i18n/nl/index.ts
+++ b/interface/src/i18n/nl/index.ts
@@ -231,7 +231,7 @@ const nl: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Client',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Optioneel',
+  OPTIONAL: 'optioneel',
   FORMATTING: 'Formatteren',
   MQTT_FORMAT: 'Topic/Payload Formattering',
   MQTT_NEST_1: 'Genest in 1 topic',
diff --git a/interface/src/i18n/no/index.ts b/interface/src/i18n/no/index.ts
index 404e31978..e52b65f61 100644
--- a/interface/src/i18n/no/index.ts
+++ b/interface/src/i18n/no/index.ts
@@ -231,7 +231,7 @@ const no: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Client',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Valgfritt',
+  OPTIONAL: 'valgfritt',
   FORMATTING: 'Formatering',
   MQTT_FORMAT: 'Topic/Payload Format',
   MQTT_NEST_1: 'Nestet i en topic',
diff --git a/interface/src/i18n/sv/index.ts b/interface/src/i18n/sv/index.ts
index 881fc728f..75eff2096 100644
--- a/interface/src/i18n/sv/index.ts
+++ b/interface/src/i18n/sv/index.ts
@@ -231,7 +231,7 @@ const sv: Translation = {
   BROKER: 'Broker',
   CLIENT: 'Client',
   BASE_TOPIC: 'Base',
-  OPTIONAL: 'Valfritt',
+  OPTIONAL: 'valfritt',
   FORMATTING: 'Formatering',
   MQTT_FORMAT: 'Topic/Payload Format',
   MQTT_NEST_1: 'Nestlat i en topic.',
diff --git a/interface/src/i18n/tr/index.ts b/interface/src/i18n/tr/index.ts
index ee03575c8..c068bddd0 100644
--- a/interface/src/i18n/tr/index.ts
+++ b/interface/src/i18n/tr/index.ts
@@ -231,7 +231,7 @@ const tr: Translation = {
   BROKER: 'Aracı',
   CLIENT: 'İstemci',
   BASE_TOPIC: 'Merkez',
-  OPTIONAL: 'Seçenekli',
+  OPTIONAL: 'seçenekli',
   FORMATTING: 'Biçimlendiriliyor',
   MQTT_FORMAT: 'Konu/Mesaj Biçimi',
   MQTT_NEST_1: 'Tek konu üzerine yerleşmiş',