Override legacy language codes for indonesian, hebrew, and yiddish (#4461)

* Manually override incorrect 'in' to 'id' lang code

* Fix additional legacy language code issues

2 files changed, 20 insertions, 2 deletions

diff --git a/src/locale/helpers.ts b/src/locale/helpers.ts
index 24ab67893..cbaaf445a 100644
--- a/src/locale/helpers.ts
+++ b/src/locale/helpers.ts
@@ -116,7 +116,7 @@ export function sanitizeAppLanguageSetting(appLanguage: string): AppLanguage {
   const langs = appLanguage.split(',').filter(Boolean)
 
   for (const lang of langs) {
-    switch (lang) {
+    switch (fixLegacyLanguageCode(lang)) {
       case 'en':
         return AppLanguage.en
       case 'ca':
@@ -157,3 +157,20 @@ export function sanitizeAppLanguageSetting(appLanguage: string): AppLanguage {
   }
   return AppLanguage.en
 }
+
+export function fixLegacyLanguageCode(code: string | null): string | null {
+  // handle some legacy code conversions, see https://xml.coverpages.org/iso639a.html
+  if (code === 'in') {
+    // indonesian
+    return 'id'
+  }
+  if (code === 'iw') {
+    // hebrew
+    return 'he'
+  }
+  if (code === 'ji') {
+    // yiddish
+    return 'yi'
+  }
+  return code
+}
diff --git a/src/platform/detection.ts b/src/platform/detection.ts
index fffde1be2..0c0360a82 100644
--- a/src/platform/detection.ts
+++ b/src/platform/detection.ts
@@ -2,6 +2,7 @@ import {Platform} from 'react-native'
 import {isReducedMotion} from 'react-native-reanimated'
 import {getLocales} from 'expo-localization'
 
+import {fixLegacyLanguageCode} from '#/locale/helpers'
 import {dedupArray} from 'lib/functions'
 
 export const isIOS = Platform.OS === 'ios'
@@ -17,7 +18,7 @@ export const isMobileWeb =
 
 export const deviceLocales = dedupArray(
   getLocales?.()
-    .map?.(locale => locale.languageCode)
+    .map?.(locale => fixLegacyLanguageCode(locale.languageCode))
     .filter(code => typeof code === 'string'),
 ) as string[]