diff --git a/apps/client/src/widgets/view_widgets/calendar_view.spec.ts b/apps/client/src/widgets/view_widgets/calendar_view.spec.ts
index a8273239c..ad6c38b02 100644
--- a/apps/client/src/widgets/view_widgets/calendar_view.spec.ts
+++ b/apps/client/src/widgets/view_widgets/calendar_view.spec.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it } from "vitest";
 import { buildNote, buildNotes } from "../../test/easy-froca.js";
-import CalendarView from "./calendar_view.js";
+import CalendarView, { getFullCalendarLocale } from "./calendar_view.js";
+import { LOCALES } from "@triliumnext/commons";
 
 describe("Building events", () => {
     it("supports start date", async () => {
@@ -174,3 +175,21 @@ describe("Promoted attributes", () => {
     });
 
 });
+
+describe("Building locales", () => {
+    it("every language has a locale defined", async () => {
+        for (const { id, contentOnly } of LOCALES) {
+            if (contentOnly) {
+                continue;
+            }
+
+            const fullCalendarLocale = await getFullCalendarLocale(id);
+
+            if (id !== "en") {
+                expect(fullCalendarLocale, `For locale ${id}`).toBeDefined();
+            } else {
+                expect(fullCalendarLocale).toBeUndefined();
+            }
+        }
+    });
+});
diff --git a/apps/client/src/widgets/view_widgets/calendar_view.ts b/apps/client/src/widgets/view_widgets/calendar_view.ts
index 65de14e4e..485691098 100644
--- a/apps/client/src/widgets/view_widgets/calendar_view.ts
+++ b/apps/client/src/widgets/view_widgets/calendar_view.ts
@@ -166,7 +166,7 @@ export default class CalendarView extends ViewMode<{}> {
             firstDay: options.getInt("firstDayOfWeek") ?? 0,
             weekends: !this.parentNote.hasAttribute("label", "calendar:hideWeekends"),
             weekNumbers: this.parentNote.hasAttribute("label", "calendar:weekNumbers"),
-            locale: await CalendarView.#getLocale(),
+            locale: await getFullCalendarLocale(options.get("locale")),
             height: "100%",
             nowIndicator: true,
             handleWindowResize: false,
@@ -246,29 +246,6 @@ export default class CalendarView extends ViewMode<{}> {
         return this.$root;
     }
 
-    static async #getLocale() {
-        const locale = options.get("locale");
-
-        // Here we hard-code the imports in order to ensure that they are embedded by webpack without having to load all the languages.
-        switch (locale) {
-            case "de":
-                return (await import("@fullcalendar/core/locales/de")).default;
-            case "es":
-                return (await import("@fullcalendar/core/locales/es")).default;
-            case "fr":
-                return (await import("@fullcalendar/core/locales/fr")).default;
-            case "cn":
-                return (await import("@fullcalendar/core/locales/zh-cn")).default;
-            case "tw":
-                return (await import("@fullcalendar/core/locales/zh-tw")).default;
-            case "ro":
-                return (await import("@fullcalendar/core/locales/ro")).default;
-            case "en":
-            default:
-                return undefined;
-        }
-    }
-
     #onDatesSet(e: DatesSetArg) {
         const currentView = e.view.type;
         if (currentView === this.lastView) {
@@ -679,3 +656,26 @@ export default class CalendarView extends ViewMode<{}> {
     }
 
 }
+
+export async function getFullCalendarLocale(locale: string) {
+    // Here we hard-code the imports in order to ensure that they are embedded by webpack without having to load all the languages.
+    switch (locale) {
+        case "de":
+            return (await import("@fullcalendar/core/locales/de")).default;
+        case "es":
+            return (await import("@fullcalendar/core/locales/es")).default;
+        case "fr":
+            return (await import("@fullcalendar/core/locales/fr")).default;
+        case "cn":
+            return (await import("@fullcalendar/core/locales/zh-cn")).default;
+        case "tw":
+            return (await import("@fullcalendar/core/locales/zh-tw")).default;
+        case "ro":
+            return (await import("@fullcalendar/core/locales/ro")).default;
+        case "ru":
+            return (await import("@fullcalendar/core/locales/ru")).default;
+        case "en":
+        default:
+            return undefined;
+    }
+}