fix(i18n): correct Irish locale flag and language label

frontend/check-locales.cjs

@@ -13,6 +13,7 @@ const allLocales = [
   ["es", "es-ES"],
   ["et", "et-EE"],
   ["fr", "fr-FR"],
+  ["ga", "ga-IE"],
   ["it", "it-IT"],
   ["ja", "ja-JP"],
   ["nl", "nl-NL"],

frontend/src/locale/IntlProvider.tsx

@@ -72,6 +72,7 @@ const getFlagCodeForLocale = (locale?: string) => {
     vi: "vn", // Vietnam
     ko: "kr", // Korea
     cs: "cz", // Czechia
+    ga: "ie", // Ireland (Irish)
   };
 
   if (specialCases[thisLocale]) {

frontend/src/locale/Utils.test.tsx

@@ -1,4 +1,4 @@
-import { formatDateTime } from "src/locale";
+import { formatDateTime, getFlagCodeForLocale } from "src/locale";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
 
 describe("DateFormatter", () => {
@@ -72,3 +72,28 @@ describe("DateFormatter", () => {
 		expect(text).toBe("-100");
 	});
 });
+
+describe("getFlagCodeForLocale", () => {
+	it("returns correct flag code for standard locales", () => {
+		expect(getFlagCodeForLocale("en-US")).toBe("EN");
+		expect(getFlagCodeForLocale("de-DE")).toBe("DE");
+		expect(getFlagCodeForLocale("fr-FR")).toBe("FR");
+	});
+
+	it("returns correct flag code for special-case locales", () => {
+		expect(getFlagCodeForLocale("ja-JP")).toBe("JP");
+		expect(getFlagCodeForLocale("zh-CN")).toBe("CN");
+		expect(getFlagCodeForLocale("vi-VN")).toBe("VN");
+		expect(getFlagCodeForLocale("ko-KR")).toBe("KR");
+		expect(getFlagCodeForLocale("cs-CZ")).toBe("CZ");
+	});
+
+	it("returns IE (Ireland) for Irish locale, not GA (Gabon)", () => {
+		expect(getFlagCodeForLocale("ga-IE")).toBe("IE");
+	});
+
+	it("falls back to EN when no locale is provided", () => {
+		expect(getFlagCodeForLocale()).toBe("EN");
+		expect(getFlagCodeForLocale(undefined)).toBe("EN");
+	});
+});

frontend/src/locale/src/lang-list.json

@@ -8,7 +8,7 @@
   "locale-et-EE": {
     "defaultMessage": "Eesti"
   },
-  "locale-ie-GA": {
+  "locale-ga-IE": {
     "defaultMessage": "Gaeilge"
   },
   "locale-de-DE": {