chore: language order (#370)

frontend/config/selection.ts

@@ -9,12 +9,17 @@ const memberRoles: MemberRoleType[] = [{ uid: 'manager' }, { uid: 'developer' },
 
 const categoricalPalette = ['#fba91e', '#6ea56c', '#3ac6e1', '#feda2f', '#f15f47', '#244470', '#9c80bb', '#f595a6'];
 
+/**
+ * Locales are grouped by script: Latin-based locales first, followed by CJK.
+ * Within Latin-based group, entries are sorted lexicographically by their BCP 47 codes.
+ * This matches common UI patterns.
+ */
 const locales: LocaleType[] = [
-  { code: 'en', name: 'English' },
-  { code: 'ja', name: '日本語' },
   { code: 'de', name: 'Deutsch' },
+  { code: 'en', name: 'English' },
   { code: 'pt-BR', name: 'Português' },
   { code: 'zh-CN', name: '简体中文' },
+  { code: 'ja', name: '日本語' },
 ];
 
 // The status of each test run

frontend/messages/strings.test.ts

@@ -1,9 +1,9 @@
 import { describe, it, expect } from 'vitest';
+import de from './de.json';
 import en from './en.json';
-import ja from './ja.json';
 import ptBR from './pt-BR.json';
 import zhCN from './zh-CN.json';
-import de from './de.json';
+import ja from './ja.json';
 
 function getAllKeys(obj: unknown, prefix = ''): string[] {
   if (typeof obj !== 'object' || obj === null) return [];
@@ -18,14 +18,15 @@ function getAllKeys(obj: unknown, prefix = ''): string[] {
 
 describe('Locale message keys consistency', () => {
   const locales = [
+    { name: 'de', data: de },
     { name: 'en', data: en },
-    { name: 'ja', data: ja },
     { name: 'pt-BR', data: ptBR },
     { name: 'zh-CN', data: zhCN },
-    { name: 'de', data: de },
+    { name: 'ja', data: ja },
   ];
 
-  const base = locales[0];
+  const base = locales.find((locale) => locale.name === 'en');
+  if (!base) throw new Error('Base locale not found');
   const baseKeys = getAllKeys(base.data);
 
   for (const locale of locales.slice(1)) {

frontend/src/i18n/routing.ts

@@ -2,7 +2,7 @@ import { createNavigation } from 'next-intl/navigation';
 import { defineRouting } from 'next-intl/routing';
 
 export const routing = defineRouting({
-  locales: ['en', 'ja', 'pt-BR', 'zh-CN', 'de'],
+  locales: ['de', 'en', 'pt-BR', 'zh-CN', 'ja'],
   defaultLocale: 'en',
   localePrefix: {
     mode: 'always',

frontend/src/middleware.ts

@@ -4,5 +4,5 @@ import { routing } from './i18n/routing';
 export default createMiddleware(routing);
 
 export const config = {
-  matcher: ['/', '/(ja|en|pt-BR|zh-CN|de)/:path*'],
+  matcher: ['/', '/(de|en|pt-BR|zh-CN|ja)/:path*'],
 };

frontend/types/locale.ts

@@ -1,4 +1,4 @@
-export type LocaleCodeType = 'en' | 'ja' | 'pt-BR' | 'zh-CN' | 'de';
+export type LocaleCodeType = 'de' | 'en' | 'pt-BR' | 'zh-CN' | 'ja';
 
 export type LocaleType = {
   code: LocaleCodeType;