diff --git a/lib/localization_delegates.dart b/lib/localization_delegates.dart
new file mode 100644
index 0000000..55beb90
--- /dev/null
+++ b/lib/localization_delegates.dart
@@ -0,0 +1,222 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+import 'package:flutter_localizations/flutter_localizations.dart';
+// ignore: implementation_imports
+import 'package:flutter_localizations/src/utils/date_localizations.dart' as util;
+import 'package:intl/intl.dart' as intl;
+
+import 'package:fladder/l10n/generated/app_localizations.dart';
+
+class FladderLocalizations {
+  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates = <LocalizationsDelegate<dynamic>>[
+    AppLocalizations.delegate,
+    FladderMaterialLocalizationsDelegate(),
+    FladderCupertinoLocalizationsDelegate(),
+    FladderWidgetsLocalizationsDelegate(),
+  ];
+}
+
+class FladderMaterialLocalizationsDelegate extends LocalizationsDelegate<MaterialLocalizations> {
+  const FladderMaterialLocalizationsDelegate();
+
+  @override
+  bool isSupported(Locale locale) => true;
+
+  static final Map<Locale, Future<MaterialLocalizations>> _loadedTranslations =
+      <Locale, Future<MaterialLocalizations>>{};
+
+  @override
+  Future<MaterialLocalizations> load(Locale locale) {
+    Locale correctedLocale = locale;
+    if (!kMaterialSupportedLanguages.contains(locale.languageCode)) {
+      correctedLocale = const Locale("en");
+    }
+    assert(isSupported(correctedLocale));
+    return _loadedTranslations.putIfAbsent(correctedLocale, () {
+      util.loadDateIntlDataIfNotLoaded();
+
+      final String localeName = intl.Intl.canonicalizedLocale(correctedLocale.toString());
+      assert(
+        correctedLocale.toString() == localeName,
+        'Flutter does not support the non-standard locale form $correctedLocale (which '
+        'might be $localeName',
+      );
+
+      intl.DateFormat fullYearFormat;
+      intl.DateFormat compactDateFormat;
+      intl.DateFormat shortDateFormat;
+      intl.DateFormat mediumDateFormat;
+      intl.DateFormat longDateFormat;
+      intl.DateFormat yearMonthFormat;
+      intl.DateFormat shortMonthDayFormat;
+      if (intl.DateFormat.localeExists(localeName)) {
+        fullYearFormat = intl.DateFormat.y(localeName);
+        compactDateFormat = intl.DateFormat.yMd(localeName);
+        shortDateFormat = intl.DateFormat.yMMMd(localeName);
+        mediumDateFormat = intl.DateFormat.MMMEd(localeName);
+        longDateFormat = intl.DateFormat.yMMMMEEEEd(localeName);
+        yearMonthFormat = intl.DateFormat.yMMMM(localeName);
+        shortMonthDayFormat = intl.DateFormat.MMMd(localeName);
+      } else if (intl.DateFormat.localeExists(correctedLocale.languageCode)) {
+        fullYearFormat = intl.DateFormat.y(correctedLocale.languageCode);
+        compactDateFormat = intl.DateFormat.yMd(correctedLocale.languageCode);
+        shortDateFormat = intl.DateFormat.yMMMd(correctedLocale.languageCode);
+        mediumDateFormat = intl.DateFormat.MMMEd(correctedLocale.languageCode);
+        longDateFormat = intl.DateFormat.yMMMMEEEEd(correctedLocale.languageCode);
+        yearMonthFormat = intl.DateFormat.yMMMM(correctedLocale.languageCode);
+        shortMonthDayFormat = intl.DateFormat.MMMd(correctedLocale.languageCode);
+      } else {
+        fullYearFormat = intl.DateFormat.y();
+        compactDateFormat = intl.DateFormat.yMd();
+        shortDateFormat = intl.DateFormat.yMMMd();
+        mediumDateFormat = intl.DateFormat.MMMEd();
+        longDateFormat = intl.DateFormat.yMMMMEEEEd();
+        yearMonthFormat = intl.DateFormat.yMMMM();
+        shortMonthDayFormat = intl.DateFormat.MMMd();
+      }
+
+      intl.NumberFormat decimalFormat;
+      intl.NumberFormat twoDigitZeroPaddedFormat;
+      if (intl.NumberFormat.localeExists(localeName)) {
+        decimalFormat = intl.NumberFormat.decimalPattern(localeName);
+        twoDigitZeroPaddedFormat = intl.NumberFormat('00', localeName);
+      } else if (intl.NumberFormat.localeExists(correctedLocale.languageCode)) {
+        decimalFormat = intl.NumberFormat.decimalPattern(correctedLocale.languageCode);
+        twoDigitZeroPaddedFormat = intl.NumberFormat('00', correctedLocale.languageCode);
+      } else {
+        decimalFormat = intl.NumberFormat.decimalPattern();
+        twoDigitZeroPaddedFormat = intl.NumberFormat('00');
+      }
+
+      return SynchronousFuture<MaterialLocalizations>(
+        getMaterialTranslation(
+          correctedLocale,
+          fullYearFormat,
+          compactDateFormat,
+          shortDateFormat,
+          mediumDateFormat,
+          longDateFormat,
+          yearMonthFormat,
+          shortMonthDayFormat,
+          decimalFormat,
+          twoDigitZeroPaddedFormat,
+        )!,
+      );
+    });
+  }
+
+  @override
+  bool shouldReload(FladderMaterialLocalizationsDelegate old) => false;
+
+  @override
+  String toString() => 'GlobalMaterialLocalizations.delegate(${kMaterialSupportedLanguages.length} locales)';
+}
+
+class FladderWidgetsLocalizationsDelegate extends LocalizationsDelegate<WidgetsLocalizations> {
+  const FladderWidgetsLocalizationsDelegate();
+
+  @override
+  bool isSupported(Locale locale) => true;
+
+  static final Map<Locale, Future<WidgetsLocalizations>> _loadedTranslations = <Locale, Future<WidgetsLocalizations>>{};
+
+  @override
+  Future<WidgetsLocalizations> load(Locale locale) {
+    Locale correctedLocale = locale;
+    if (!kMaterialSupportedLanguages.contains(locale.languageCode)) {
+      correctedLocale = const Locale("en");
+    }
+    assert(isSupported(correctedLocale));
+    return _loadedTranslations.putIfAbsent(correctedLocale, () {
+      return SynchronousFuture<WidgetsLocalizations>(getWidgetsTranslation(correctedLocale)!);
+    });
+  }
+
+  @override
+  bool shouldReload(covariant LocalizationsDelegate<WidgetsLocalizations> old) => false;
+}
+
+class FladderCupertinoLocalizationsDelegate extends LocalizationsDelegate<CupertinoLocalizations> {
+  const FladderCupertinoLocalizationsDelegate();
+
+  @override
+  bool isSupported(Locale locale) => true;
+
+  static final Map<Locale, Future<CupertinoLocalizations>> _loadedTranslations =
+      <Locale, Future<CupertinoLocalizations>>{};
+
+  @override
+  Future<CupertinoLocalizations> load(Locale locale) {
+    Locale correctedLocale = locale;
+    if (!kMaterialSupportedLanguages.contains(locale.languageCode)) {
+      correctedLocale = const Locale("en");
+    }
+    assert(isSupported(correctedLocale));
+    return _loadedTranslations.putIfAbsent(correctedLocale, () {
+      util.loadDateIntlDataIfNotLoaded();
+
+      final String localeName = intl.Intl.canonicalizedLocale(correctedLocale.toString());
+      assert(
+        correctedLocale.toString() == localeName,
+        'Flutter does not support the non-standard locale form $correctedLocale (which '
+        'might be $localeName',
+      );
+
+      late intl.DateFormat fullYearFormat;
+      late intl.DateFormat dayFormat;
+      late intl.DateFormat weekdayFormat;
+      late intl.DateFormat mediumDateFormat;
+      // We don't want any additional decoration here. The am/pm is handled in
+      // the date picker. We just want an hour number localized.
+      late intl.DateFormat singleDigitHourFormat;
+      late intl.DateFormat singleDigitMinuteFormat;
+      late intl.DateFormat doubleDigitMinuteFormat;
+      late intl.DateFormat singleDigitSecondFormat;
+      late intl.NumberFormat decimalFormat;
+
+      void loadFormats(String? correctedLocale) {
+        fullYearFormat = intl.DateFormat.y(correctedLocale);
+        dayFormat = intl.DateFormat.d(correctedLocale);
+        weekdayFormat = intl.DateFormat.E(correctedLocale);
+        mediumDateFormat = intl.DateFormat.MMMEd(correctedLocale);
+        // TODO(xster): fix when https://github.com/dart-lang/intl/issues/207 is resolved.
+        singleDigitHourFormat = intl.DateFormat('HH', correctedLocale);
+        singleDigitMinuteFormat = intl.DateFormat.m(correctedLocale);
+        doubleDigitMinuteFormat = intl.DateFormat('mm', correctedLocale);
+        singleDigitSecondFormat = intl.DateFormat.s(correctedLocale);
+        decimalFormat = intl.NumberFormat.decimalPattern(correctedLocale);
+      }
+
+      if (intl.DateFormat.localeExists(localeName)) {
+        loadFormats(localeName);
+      } else if (intl.DateFormat.localeExists(correctedLocale.languageCode)) {
+        loadFormats(correctedLocale.languageCode);
+      } else {
+        loadFormats(null);
+      }
+
+      return SynchronousFuture<CupertinoLocalizations>(
+        getCupertinoTranslation(
+          correctedLocale,
+          fullYearFormat,
+          dayFormat,
+          weekdayFormat,
+          mediumDateFormat,
+          singleDigitHourFormat,
+          singleDigitMinuteFormat,
+          doubleDigitMinuteFormat,
+          singleDigitSecondFormat,
+          decimalFormat,
+        )!,
+      );
+    });
+  }
+
+  @override
+  bool shouldReload(FladderCupertinoLocalizationsDelegate old) => false;
+
+  @override
+  String toString() => 'GlobalCupertinoLocalizations.delegate(${kCupertinoSupportedLanguages.length} locales)';
+}
diff --git a/lib/main.dart b/lib/main.dart
index a48b71f..c1b1b34 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -16,6 +16,7 @@ import 'package:universal_html/html.dart' as html;
 import 'package:window_manager/window_manager.dart';
 
 import 'package:fladder/l10n/generated/app_localizations.dart';
+import 'package:fladder/localization_delegates.dart';
 import 'package:fladder/models/account_model.dart';
 import 'package:fladder/models/settings/arguments_model.dart';
 import 'package:fladder/providers/arguments_provider.dart';
@@ -271,7 +272,7 @@ class _MainState extends ConsumerState<Main> with WindowListener, WidgetsBinding
                 mouseDrag ? PointerDeviceKind.mouse : null,
               }.nonNulls.toSet(),
             ),
-            localizationsDelegates: AppLocalizations.localizationsDelegates,
+            localizationsDelegates: FladderLocalizations.localizationsDelegates,
             supportedLocales: AppLocalizations.supportedLocales,
             locale: language,
             localeResolutionCallback: (locale, supportedLocales) {