diff --git a/src/common/translations/auto_case_noun.ts b/src/common/translations/auto_case_noun.ts
new file mode 100644
index 0000000000..5099003631
--- /dev/null
+++ b/src/common/translations/auto_case_noun.ts
@@ -0,0 +1,19 @@
+// In a few languages nouns are always capitalized. This helper
+// indicates if for a given language that is the case.
+
+import { capitalizeFirstLetter } from "../string/capitalize-first-letter";
+
+export const useCapitalizedNouns = (language: string): boolean => {
+  switch (language) {
+    case "de":
+    case "lb":
+      return true;
+    default:
+      return false;
+  }
+};
+
+export const autoCaseNoun = (noun: string, language: string): string =>
+  useCapitalizedNouns(language)
+    ? capitalizeFirstLetter(noun)
+    : noun.toLocaleLowerCase(language);
diff --git a/src/data/logbook.ts b/src/data/logbook.ts
index 1bb048abdc..f5caa718b7 100644
--- a/src/data/logbook.ts
+++ b/src/data/logbook.ts
@@ -7,6 +7,7 @@ import {
 import { computeDomain } from "../common/entity/compute_domain";
 import { computeStateDisplay } from "../common/entity/compute_state_display";
 import { computeStateDomain } from "../common/entity/compute_state_domain";
+import { autoCaseNoun } from "../common/translations/auto_case_noun";
 import { LocalizeFunc } from "../common/translations/localize";
 import { HaEntityPickerEntityFilterFunc } from "../components/entity/ha-entity-picker";
 import { HomeAssistant } from "../types";
@@ -359,15 +360,21 @@ export const localizeStateMessage = (
         case "vibration":
           if (isOn) {
             return localize(`${LOGBOOK_LOCALIZE_PATH}.detected_device_class`, {
-              device_class: localize(
-                `component.binary_sensor.entity_component.${device_class}.name`
+              device_class: autoCaseNoun(
+                localize(
+                  `component.binary_sensor.entity_component.${device_class}.name`
+                ),
+                hass.language
               ),
             });
           }
           if (isOff) {
             return localize(`${LOGBOOK_LOCALIZE_PATH}.cleared_device_class`, {
-              device_class: localize(
-                `component.binary_sensor.entity_component.${device_class}.name`
+              device_class: autoCaseNoun(
+                localize(
+                  `component.binary_sensor.entity_component.${device_class}.name`
+                ),
+                hass.language
               ),
             });
           }