fix(i18n): standardize locale formatting for Intl APIs

web/default/src/components/language-switcher.tsx

@@ -39,7 +39,6 @@ export function LanguageSwitcher() {
   const { i18n, t } = useTranslation()
   const user = useAuthStore((s) => s.auth.user)
   const currentLanguage = normalizeInterfaceLanguage(i18n.language)
-  console.log('Current interface language: %s', currentLanguage)
   const handleChangeLanguage = useCallback(
     async (code: string) => {
       await i18n.changeLanguage(code)

web/default/src/features/channels/components/channels-columns.tsx

@@ -51,6 +51,7 @@ import {
   formatQuotaWithCurrency,
   getCurrencyLabel,
 } from '@/lib/currency'
+import { toIntlLocale } from '@/i18n/languages'
 import { formatTimestampToDate } from '@/lib/format'
 import { truncateText } from '@/lib/utils'
 
@@ -310,7 +311,7 @@ function BalanceCell({ channel }: { channel: Channel }) {
   const withSuffix = (value: string) =>
     tokenSuffix && value !== '-' ? `${value}${tokenSuffix}` : value
 
-  const locale = i18n.resolvedLanguage || i18n.language
+  const locale = toIntlLocale(i18n.resolvedLanguage || i18n.language)
   const balanceFormatOptions = {
     digitsLarge: 2,
     digitsSmall: 4,
@@ -519,7 +520,7 @@ export function useChannelsColumns(
   const { t, i18n } = useTranslation()
   const { sensitiveVisible } = useChannels()
   const enableSelection = options.enableSelection ?? true
-  const locale = i18n.resolvedLanguage || i18n.language
+  const locale = toIntlLocale(i18n.resolvedLanguage || i18n.language)
   // The column definitions only depend on the translation function, the active
   // locale, and sensitive-data visibility. Memoizing keeps the array (and every
   // cell renderer reference) stable across unrelated re-renders, so react-table

web/default/src/features/dashboard/components/models/log-stat-cards.tsx

@@ -31,6 +31,7 @@ import type {
   QuotaDataItem,
   DashboardFilters,
 } from '@/features/dashboard/types'
+import { toIntlLocale } from '@/i18n/languages'
 import { formatCompactNumber, formatNumber, formatQuota } from '@/lib/format'
 import { computeTimeRange } from '@/lib/time'
 import { cn } from '@/lib/utils'
@@ -121,7 +122,7 @@ export function LogStatCards(props: LogStatCardsProps) {
 
   const items = statCardsConfig.map((config) => {
     const rawValue = config.getValue(adaptedStats, timeRangeMinutes)
-    const locale = i18n.resolvedLanguage || i18n.language
+    const locale = toIntlLocale(i18n.resolvedLanguage || i18n.language)
     const formatted =
       config.key === 'quota'
         ? {

web/default/src/features/system-info/components/system-instances-panel.tsx

@@ -47,6 +47,7 @@ import {
   TooltipProvider,
   TooltipTrigger,
 } from '@/components/ui/tooltip'
+import { toIntlLocale } from '@/i18n/languages'
 import { formatTimestampRelative, formatTimestampToDate } from '@/lib/format'
 import { cn } from '@/lib/utils'
 
@@ -411,7 +412,7 @@ function SystemInstancesList(props: SystemInstancesTableProps) {
                   {formatTimestampRelative(
                     instance.last_seen_at,
                     'seconds',
-                    i18n.language
+                    toIntlLocale(i18n.language)
                   )}
                 </TableCell>
               </TableRow>

web/default/src/features/system-info/components/system-tasks-panel.tsx

@@ -38,6 +38,7 @@ import type {
   SystemTask,
   SystemTaskStatus,
 } from '@/features/system-settings/types'
+import { toIntlLocale } from '@/i18n/languages'
 import { formatTimestampRelative, formatTimestampToDate } from '@/lib/format'
 import { cn } from '@/lib/utils'
 
@@ -185,7 +186,7 @@ function SystemTasksTable(props: SystemTasksTableProps) {
                   {formatTimestampRelative(
                     task.updated_at,
                     'seconds',
-                    i18n.language
+                    toIntlLocale(i18n.language)
                   )}
                 </TableCell>
                 <TableCell

web/default/src/i18n/languages.ts

@@ -41,8 +41,33 @@ export function normalizeInterfaceLanguage(value?: string | null): string {
     normalized = 'zhCN'
   }
 
-  console.log('Normalized interface language: %s -> %s', value, normalized)
   return INTERFACE_LANGUAGE_OPTIONS.some((lang) => lang.code === normalized)
     ? normalized
     : 'en'
 }
+
+/**
+ * Convert an interface language code (the values i18next uses, such as `zhCN` /
+ * `zhTW`) into a valid BCP-47 locale tag that the `Intl.*` APIs accept.
+ *
+ * `new Intl.NumberFormat('zhCN')` throws `RangeError: Invalid language tag`, so
+ * any locale derived from `i18n.language` / `i18n.resolvedLanguage` MUST be run
+ * through this before it reaches an `Intl` constructor. Unknown values fall back
+ * to `undefined`, which makes `Intl` use the runtime default locale.
+ */
+export function toIntlLocale(value?: string | null): string | undefined {
+  if (!value) return undefined
+  switch (value) {
+    case 'zhCN':
+      return 'zh-CN'
+    case 'zhTW':
+      return 'zh-TW'
+    default:
+      break
+  }
+  try {
+    return Intl.getCanonicalLocales(value)[0]
+  } catch {
+    return undefined
+  }
+}