diff --git a/app/javascript/flavours/glitch/actions/streaming.js b/app/javascript/flavours/glitch/actions/streaming.js
index e16a7409e..f1c44d2e2 100644
--- a/app/javascript/flavours/glitch/actions/streaming.js
+++ b/app/javascript/flavours/glitch/actions/streaming.js
@@ -1,6 +1,6 @@
 // @ts-check
 
-import { getLocale } from 'mastodon/locales';
+import { getLocale } from 'flavours/glitch/locales';
 
 import { connectStream } from '../stream';
 
@@ -25,8 +25,6 @@ import {
   fillListTimelineGaps,
 } from './timelines';
 
-const { messages } = getLocale();
-
 /**
  * @param {number} max
  * @returns {number}
@@ -44,8 +42,10 @@ const randomUpTo = max =>
  * @param {function(object): boolean} [options.accept]
  * @returns {function(): void}
  */
-export const connectTimelineStream = (timelineId, channelName, params = {}, options = {}) =>
-  connectStream(channelName, params, (dispatch, getState) => {
+export const connectTimelineStream = (timelineId, channelName, params = {}, options = {}) => {
+  const { messages } = getLocale();
+
+  return connectStream(channelName, params, (dispatch, getState) => {
     const locale = getState().getIn(['meta', 'locale']);
 
     // @ts-expect-error
@@ -122,6 +122,7 @@ export const connectTimelineStream = (timelineId, channelName, params = {}, opti
       },
     };
   });
+};
 
 /**
  * @param {Function} dispatch
diff --git a/app/javascript/flavours/glitch/containers/admin_component.jsx b/app/javascript/flavours/glitch/containers/admin_component.jsx
index a4dbe9c43..06c846f4d 100644
--- a/app/javascript/flavours/glitch/containers/admin_component.jsx
+++ b/app/javascript/flavours/glitch/containers/admin_component.jsx
@@ -1,24 +1,19 @@
 import PropTypes from 'prop-types';
 import { PureComponent } from 'react';
 
-import { IntlProvider } from 'react-intl';
-
-import { getLocale, onProviderError } from 'mastodon/locales';
-
-const { messages } = getLocale();
+import { IntlProvider } from 'flavours/glitch/locales';
 
 export default class AdminComponent extends PureComponent {
 
   static propTypes = {
-    locale: PropTypes.string.isRequired,
     children: PropTypes.node.isRequired,
   };
 
   render () {
-    const { locale, children } = this.props;
+    const { children } = this.props;
 
     return (
-      <IntlProvider locale={locale} messages={messages} onError={onProviderError}>
+      <IntlProvider>
         {children}
       </IntlProvider>
     );
diff --git a/app/javascript/flavours/glitch/containers/compose_container.jsx b/app/javascript/flavours/glitch/containers/compose_container.jsx
index f053fc6d4..f92bf9797 100644
--- a/app/javascript/flavours/glitch/containers/compose_container.jsx
+++ b/app/javascript/flavours/glitch/containers/compose_container.jsx
@@ -1,37 +1,25 @@
-import PropTypes from 'prop-types';
 import { PureComponent } from 'react';
 
-import { IntlProvider } from 'react-intl';
-
 import { Provider } from 'react-redux';
 
 import { fetchCustomEmojis } from 'flavours/glitch/actions/custom_emojis';
 import { hydrateStore } from 'flavours/glitch/actions/store';
 import Compose from 'flavours/glitch/features/standalone/compose';
 import initialState from 'flavours/glitch/initial_state';
+import { IntlProvider } from 'flavours/glitch/locales';
 import { store } from 'flavours/glitch/store';
 
-import { getLocale, onProviderError } from 'mastodon/locales';
-
-const { messages } = getLocale();
-
 if (initialState) {
   store.dispatch(hydrateStore(initialState));
 }
 
 store.dispatch(fetchCustomEmojis());
 
-export default class TimelineContainer extends PureComponent {
-
-  static propTypes = {
-    locale: PropTypes.string.isRequired,
-  };
+export default class ComposeContainer extends PureComponent {
 
   render () {
-    const { locale } = this.props;
-
     return (
-      <IntlProvider locale={locale} messages={messages} onError={onProviderError}>
+      <IntlProvider>
         <Provider store={store}>
           <Compose />
         </Provider>
diff --git a/app/javascript/flavours/glitch/containers/mastodon.jsx b/app/javascript/flavours/glitch/containers/mastodon.jsx
index fc09582e6..ae2eb0b60 100644
--- a/app/javascript/flavours/glitch/containers/mastodon.jsx
+++ b/app/javascript/flavours/glitch/containers/mastodon.jsx
@@ -1,8 +1,6 @@
 import PropTypes from 'prop-types';
 import { PureComponent } from 'react';
 
-import { IntlProvider } from 'react-intl';
-
 import { Helmet } from 'react-helmet';
 import { BrowserRouter, Route } from 'react-router-dom';
 
@@ -17,10 +15,8 @@ import { connectUserStream } from 'flavours/glitch/actions/streaming';
 import ErrorBoundary from 'flavours/glitch/components/error_boundary';
 import UI from 'flavours/glitch/features/ui';
 import initialState, { title as siteTitle } from 'flavours/glitch/initial_state';
+import { IntlProvider } from 'flavours/glitch/locales';
 import { store } from 'flavours/glitch/store';
-import { getLocale, onProviderError } from 'locales';
-
-const { messages } = getLocale();
 
 const title = process.env.NODE_ENV === 'production' ? siteTitle : `${siteTitle} (Dev)`;
 
@@ -44,10 +40,6 @@ const createIdentityContext = state => ({
 
 export default class Mastodon extends PureComponent {
 
-  static propTypes = {
-    locale: PropTypes.string.isRequired,
-  };
-
   static childContextTypes = {
     identity: PropTypes.shape({
       signedIn: PropTypes.bool.isRequired,
@@ -83,10 +75,8 @@ export default class Mastodon extends PureComponent {
   }
 
   render () {
-    const { locale } = this.props;
-
     return (
-      <IntlProvider locale={locale} messages={messages} onError={onProviderError}>
+      <IntlProvider>
         <ReduxProvider store={store}>
           <ErrorBoundary>
             <BrowserRouter>
diff --git a/app/javascript/flavours/glitch/containers/media_container.jsx b/app/javascript/flavours/glitch/containers/media_container.jsx
index 99447aebd..52aac5ebe 100644
--- a/app/javascript/flavours/glitch/containers/media_container.jsx
+++ b/app/javascript/flavours/glitch/containers/media_container.jsx
@@ -2,8 +2,6 @@ import PropTypes from 'prop-types';
 import { PureComponent } from 'react';
 import { createPortal } from 'react-dom';
 
-import { IntlProvider } from 'react-intl';
-
 import { fromJS } from 'immutable';
 
 import { ImmutableHashtag as Hashtag } from 'flavours/glitch/components/hashtag';
@@ -14,18 +12,14 @@ import Audio from 'flavours/glitch/features/audio';
 import Card from 'flavours/glitch/features/status/components/card';
 import MediaModal from 'flavours/glitch/features/ui/components/media_modal';
 import Video from 'flavours/glitch/features/video';
+import { IntlProvider } from 'flavours/glitch/locales';
 import { getScrollbarWidth } from 'flavours/glitch/utils/scrollbar';
 
-import { getLocale, onProviderError } from 'mastodon/locales';
-
-const { messages } = getLocale();
-
 const MEDIA_COMPONENTS = { MediaGallery, Video, Card, Poll, Hashtag, Audio };
 
 export default class MediaContainer extends PureComponent {
 
   static propTypes = {
-    locale: PropTypes.string.isRequired,
     components: PropTypes.object.isRequired,
   };
 
@@ -74,7 +68,7 @@ export default class MediaContainer extends PureComponent {
   };
 
   render () {
-    const { locale, components } = this.props;
+    const { components } = this.props;
 
     let handleOpenVideo;
 
@@ -84,7 +78,7 @@ export default class MediaContainer extends PureComponent {
     }
 
     return (
-      <IntlProvider locale={locale} messages={messages} onError={onProviderError}>
+      <IntlProvider>
         <>
           {[].map.call(components, (component, i) => {
             const componentName = component.getAttribute('data-component');
diff --git a/app/javascript/flavours/glitch/load_locale.js b/app/javascript/flavours/glitch/load_locale.js
deleted file mode 100644
index 1c22bfd31..000000000
--- a/app/javascript/flavours/glitch/load_locale.js
+++ /dev/null
@@ -1,21 +0,0 @@
-import { setLocale } from 'locales';
-
-export async function loadLocale() {
-  const locale = document.querySelector('html').lang || 'en';
-
-  const upstreamLocaleData = await import(
-    /* webpackMode: "lazy" */
-    /* webpackChunkName: "locales/vanilla/[request]" */
-    /* webpackInclude: /\.json$/ */
-    /* webpackPreload: true */
-    `mastodon/locales/${locale}.json`);
-
-  const localeData = await import(
-    /* webpackMode: "lazy" */
-    /* webpackChunkName: "locales/glitch/[request]" */
-    /* webpackInclude: /\.json$/ */
-    /* webpackPreload: true */
-    `flavours/glitch/locales/${locale}.json`);
-
-  setLocale({ messages: {...upstreamLocaleData, ...localeData} });
-}
diff --git a/app/javascript/flavours/glitch/locales/global_locale.ts b/app/javascript/flavours/glitch/locales/global_locale.ts
new file mode 100644
index 000000000..01133ca23
--- /dev/null
+++ b/app/javascript/flavours/glitch/locales/global_locale.ts
@@ -0,0 +1,22 @@
+export interface LocaleData {
+  locale: string;
+  messages: Record<string, string>;
+}
+
+let loadedLocale: LocaleData;
+
+export function setLocale(locale: LocaleData) {
+  loadedLocale = locale;
+}
+
+export function getLocale() {
+  if (!loadedLocale && process.env.NODE_ENV === 'development') {
+    throw new Error('getLocale() called before any locale has been set');
+  }
+
+  return loadedLocale;
+}
+
+export function isLocaleLoaded() {
+  return !!loadedLocale;
+}
diff --git a/app/javascript/flavours/glitch/locales/index.ts b/app/javascript/flavours/glitch/locales/index.ts
new file mode 100644
index 000000000..63f45c304
--- /dev/null
+++ b/app/javascript/flavours/glitch/locales/index.ts
@@ -0,0 +1,5 @@
+export type { LocaleData } from './global_locale';
+export { setLocale, getLocale, isLocaleLoaded } from './global_locale';
+export { loadLocale } from './load_locale';
+
+export { IntlProvider } from './intl_provider';
diff --git a/app/javascript/flavours/glitch/locales/intl_provider.tsx b/app/javascript/flavours/glitch/locales/intl_provider.tsx
new file mode 100644
index 000000000..1ea77c798
--- /dev/null
+++ b/app/javascript/flavours/glitch/locales/intl_provider.tsx
@@ -0,0 +1,56 @@
+import { useEffect, useState } from 'react';
+
+import { IntlProvider as BaseIntlProvider } from 'react-intl';
+
+import { getLocale, isLocaleLoaded } from './global_locale';
+import { loadLocale } from './load_locale';
+
+function onProviderError(error: unknown) {
+  // Silent the error, like upstream does
+  if (process.env.NODE_ENV === 'production') return;
+
+  // This browser does not advertise Intl support for this locale, we only print a warning
+  // As-per the spec, the browser should select the best matching locale
+  if (
+    error &&
+    typeof error === 'object' &&
+    error instanceof Error &&
+    error.message.match('MISSING_DATA')
+  ) {
+    console.warn(error.message);
+  }
+
+  console.error(error);
+}
+
+export const IntlProvider: React.FC<
+  Omit<React.ComponentProps<typeof BaseIntlProvider>, 'locale' | 'messages'>
+> = ({ children, ...props }) => {
+  const [localeLoaded, setLocaleLoaded] = useState(false);
+
+  useEffect(() => {
+    async function loadLocaleData() {
+      if (!isLocaleLoaded()) {
+        await loadLocale();
+      }
+
+      setLocaleLoaded(true);
+    }
+    void loadLocaleData();
+  }, []);
+
+  if (!localeLoaded) return null;
+
+  const { locale, messages } = getLocale();
+
+  return (
+    <BaseIntlProvider
+      locale={locale}
+      messages={messages}
+      onError={onProviderError}
+      {...props}
+    >
+      {children}
+    </BaseIntlProvider>
+  );
+};
diff --git a/app/javascript/flavours/glitch/locales/load_locale.ts b/app/javascript/flavours/glitch/locales/load_locale.ts
new file mode 100644
index 000000000..fa5d13bbc
--- /dev/null
+++ b/app/javascript/flavours/glitch/locales/load_locale.ts
@@ -0,0 +1,37 @@
+import { Semaphore } from 'async-mutex';
+
+import type { LocaleData } from './global_locale';
+import { isLocaleLoaded, setLocale } from './global_locale';
+
+const localeLoadingSemaphore = new Semaphore(1);
+
+export async function loadLocale() {
+  const locale = document.querySelector<HTMLElement>('html')?.lang || 'en';
+
+  // We use a Semaphore here so only one thing can try to load the locales at
+  // the same time. If one tries to do it while its in progress, it will wait
+  // for the initial load to finish before it is resumed (and will see that locale
+  // data is already loaded)
+  await localeLoadingSemaphore.runExclusive(async () => {
+    // if the locale is already set, then do nothing
+    if (isLocaleLoaded()) return;
+
+    const upstreamLocaleData = await import(
+      /* webpackMode: "lazy" */
+      /* webpackChunkName: "locales/vanilla/[request]" */
+      /* webpackInclude: /\.json$/ */
+      /* webpackPreload: true */
+      `mastodon/locales/${locale}.json`
+    ) as LocaleData['messages'];
+
+    const localeData = await import(
+      /* webpackMode: "lazy" */
+      /* webpackChunkName: "locales/glitch/[request]" */
+      /* webpackInclude: /\.json$/ */
+      /* webpackPreload: true */
+      `flavours/glitch/locales/${locale}.json`
+    ) as LocaleData['messages'];
+
+    setLocale({ messages: { ...upstreamLocaleData, ...localeData }, locale });
+  });
+}
diff --git a/app/javascript/flavours/glitch/packs/admin.jsx b/app/javascript/flavours/glitch/packs/admin.jsx
index 4a5a50b49..596611dad 100644
--- a/app/javascript/flavours/glitch/packs/admin.jsx
+++ b/app/javascript/flavours/glitch/packs/admin.jsx
@@ -6,14 +6,14 @@ import ready from 'flavours/glitch/ready';
 ready(() => {
   [].forEach.call(document.querySelectorAll('[data-admin-component]'), element => {
     const componentName  = element.getAttribute('data-admin-component');
-    const { locale, ...componentProps } = JSON.parse(element.getAttribute('data-props'));
+    const { ...componentProps } = JSON.parse(element.getAttribute('data-props'));
 
     import('flavours/glitch/containers/admin_component').then(({ default: AdminComponent }) => {
       return import('flavours/glitch/components/admin/' + componentName).then(({ default: Component }) => {
         const root = createRoot(element);
 
         root.render (
-          <AdminComponent locale={locale}>
+          <AdminComponent>
             <Component {...componentProps} />
           </AdminComponent>,
         );
diff --git a/app/javascript/flavours/glitch/packs/home.js b/app/javascript/flavours/glitch/packs/home.js
index 5497ba85e..842430354 100644
--- a/app/javascript/flavours/glitch/packs/home.js
+++ b/app/javascript/flavours/glitch/packs/home.js
@@ -1,11 +1,11 @@
 import 'packs/public-path';
-import { loadLocale } from 'flavours/glitch/load_locale';
+import { loadLocale } from 'flavours/glitch/locales';
+import main from "flavours/glitch/main";
 import { loadPolyfills } from 'flavours/glitch/polyfills';
 
-loadPolyfills().then(loadLocale).then(async () => {
-  const { default: main } = await import('flavours/glitch/main');
-
-  return main();
-}).catch(e => {
-  console.error(e);
-});
+loadPolyfills()
+  .then(loadLocale)
+  .then(main)
+  .catch(e => {
+    console.error(e);
+  });
diff --git a/app/javascript/flavours/glitch/packs/public.jsx b/app/javascript/flavours/glitch/packs/public.jsx
index 4edc06b38..22a3e1214 100644
--- a/app/javascript/flavours/glitch/packs/public.jsx
+++ b/app/javascript/flavours/glitch/packs/public.jsx
@@ -1,7 +1,7 @@
 import 'packs/public-path';
 import { createRoot }  from 'react-dom/client';
 
-import * as IntlMessageFormat  from 'intl-messageformat';
+import { IntlMessageFormat } from 'intl-messageformat';
 import { defineMessages } from 'react-intl';
 
 import { delegate }  from '@rails/ujs';
@@ -12,10 +12,9 @@ import { throttle } from 'lodash';
 import { timeAgoString }  from 'flavours/glitch/components/relative_timestamp';
 import emojify  from 'flavours/glitch/features/emoji/emoji';
 import loadKeyboardExtensions from 'flavours/glitch/load_keyboard_extensions';
-import { loadLocale } from 'flavours/glitch/load_locale';
+import { loadLocale, getLocale } from 'flavours/glitch/locales';
 import { loadPolyfills } from 'flavours/glitch/polyfills';
 import ready from 'flavours/glitch/ready';
-import { getLocale }  from 'locales';
 
 const messages = defineMessages({
   usernameTaken: { id: 'username.taken', defaultMessage: 'That username is taken. Try another' },
@@ -24,7 +23,7 @@ const messages = defineMessages({
 });
 
 function main() {
-  const { localeData } = getLocale();
+  const { messages: localeData } = getLocale();
 
   const scrollToDetailedStatus = () => {
     const history = createBrowserHistory();
diff --git a/app/javascript/flavours/glitch/packs/share.jsx b/app/javascript/flavours/glitch/packs/share.jsx
index 1b8c837b6..21f1da638 100644
--- a/app/javascript/flavours/glitch/packs/share.jsx
+++ b/app/javascript/flavours/glitch/packs/share.jsx
@@ -2,7 +2,6 @@ import 'packs/public-path';
 import { createRoot } from 'react-dom/client';
 
 import ComposeContainer from 'flavours/glitch/containers/compose_container';
-import { loadLocale } from 'flavours/glitch/load_locale';
 import { loadPolyfills } from 'flavours/glitch/polyfills';
 import ready from 'flavours/glitch/ready';
 
@@ -23,6 +22,6 @@ function main() {
   ready(loaded);
 }
 
-loadPolyfills().then(loadLocale).then(main).catch(error => {
+loadPolyfills().then(main).catch(error => {
   console.error(error);
 });