diff --git a/ui/__snapshots__/qa.spec.ts.snap b/ui/__snapshots__/qa.spec.ts.snap
index a853551a..a2779860 100644
--- a/ui/__snapshots__/qa.spec.ts.snap
+++ b/ui/__snapshots__/qa.spec.ts.snap
@@ -106,7 +106,7 @@ var closeIconHTML = '<span class="fa fa-close fa-sm"></span>';
 var closeBtnHTML = \`<button id="\${closeBtnId}" type="button" class="close">\${closeIconHTML}</button>\`;
 
 // helpers/countdown.ts
-var formatDeadline = (time) => {
+var formatDeadline = (time, locales = [LOCALE, void 0]) => {
   let unit = "second";
   let timeLeft = (time - Date.now()) / 1e3;
   if (timeLeft >= 60) {
@@ -118,14 +118,22 @@ var formatDeadline = (time) => {
     unit = "hour";
   }
   const isLastMinute = unit === "minute" && timeLeft < 2;
-  const formattedTimeLeft = new Intl.NumberFormat(LOCALE, {
-    style: "unit",
-    unitDisplay: "long",
-    minimumFractionDigits: isLastMinute ? 1 : 0,
-    maximumFractionDigits: isLastMinute ? 1 : 0,
-    unit
-  }).format(Math.max(0, timeLeft));
-  return \`in \${formattedTimeLeft}\`;
+  const nonNegTimeLeft = Math.max(0, timeLeft);
+  for (const locale of locales) {
+    try {
+      const formattedTimeLeft = new Intl.NumberFormat(locale, {
+        style: "unit",
+        unitDisplay: "long",
+        minimumFractionDigits: isLastMinute ? 1 : 0,
+        maximumFractionDigits: isLastMinute ? 1 : 0,
+        unit
+      }).format(nonNegTimeLeft);
+      return \`in \${formattedTimeLeft}\`;
+    } catch (error) {
+      console.warn(\`Failed to format time using \${locale} locale\`, error);
+    }
+  }
+  return \`in \${nonNegTimeLeft} \${unit}\${nonNegTimeLeft === 1 ? "" : "s"}\`;
 };
 var getCountdownDelay = (deadline) => deadline - Date.now() > 12e4 ? 6e4 : 1e3;
 var setCountdown = (selector, deadline) => {
diff --git a/ui/helpers/countdown.spec.ts b/ui/helpers/countdown.spec.ts
index cf0c7dd3..1389793c 100644
--- a/ui/helpers/countdown.spec.ts
+++ b/ui/helpers/countdown.spec.ts
@@ -46,6 +46,31 @@ describe("Countdown helpers", () => {
         expect(formatDeadline(Date.now() + offset * 1000)).toMatchSnapshot();
       },
     );
+
+    test.each([
+      [10000, "10 seconds"],
+      [60000, "1 minute"],
+      [-10000, "0 seconds"],
+    ])(`should handle invalid locales %#`, (offset, label) => {
+      const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+      expect(
+        formatDeadline(Date.now() + offset, [
+          "invalid_locale_id",
+          "another_invalid_one",
+        ]),
+      ).toBe(`in ${label}`);
+      expect(warnSpy).toHaveBeenCalledTimes(2);
+      expect(warnSpy.mock.calls).toEqual([
+        [
+          "Failed to format time using invalid_locale_id locale",
+          expect.any(Error),
+        ],
+        [
+          "Failed to format time using another_invalid_one locale",
+          expect.any(Error),
+        ],
+      ]);
+    });
   });
 
   describe("getCountdownDelay() helper", () => {
diff --git a/ui/helpers/countdown.ts b/ui/helpers/countdown.ts
index 62d86f77..1903a6a8 100644
--- a/ui/helpers/countdown.ts
+++ b/ui/helpers/countdown.ts
@@ -1,4 +1,7 @@
-export const formatDeadline = (time: number): string => {
+export const formatDeadline = (
+  time: number,
+  locales = [LOCALE, undefined],
+): string => {
   let unit: "second" | "minute" | "hour" = "second";
   let timeLeft = (time - Date.now()) / 1000;
   if (timeLeft >= 60) {
@@ -10,14 +13,22 @@ export const formatDeadline = (time: number): string => {
     unit = "hour";
   }
   const isLastMinute = unit === "minute" && timeLeft < 2;
-  const formattedTimeLeft = new Intl.NumberFormat(LOCALE, {
-    style: "unit",
-    unitDisplay: "long",
-    minimumFractionDigits: isLastMinute ? 1 : 0,
-    maximumFractionDigits: isLastMinute ? 1 : 0,
-    unit,
-  }).format(Math.max(0, timeLeft));
-  return `in ${formattedTimeLeft}`;
+  const nonNegTimeLeft = Math.max(0, timeLeft);
+  for (const locale of locales) {
+    try {
+      const formattedTimeLeft = new Intl.NumberFormat(locale, {
+        style: "unit",
+        unitDisplay: "long",
+        minimumFractionDigits: isLastMinute ? 1 : 0,
+        maximumFractionDigits: isLastMinute ? 1 : 0,
+        unit,
+      }).format(nonNegTimeLeft);
+      return `in ${formattedTimeLeft}`;
+    } catch (error) {
+      console.warn(`Failed to format time using ${locale} locale`, error);
+    }
+  }
+  return `in ${nonNegTimeLeft} ${unit}${nonNegTimeLeft === 1 ? "" : "s"}`;
 };
 
 export const getCountdownDelay = (deadline: number): number =>