From 6f3f75d9b42f302324f3dafe211e8a6d9b8ad5e5 Mon Sep 17 00:00:00 2001
From: Henry Jameson <me@hjkos.com>
Date: Fri, 13 Feb 2026 14:48:39 +0200
Subject: [PATCH] i18n

This reverts commit 829018b656c52e8f8dc8bd5a9f74e83f46b71567.
---
 src/lib/language.js | 14 ++++++++++++++
 src/stores/i18n.js  | 20 ++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 src/lib/language.js

diff --git a/src/lib/language.js b/src/lib/language.js
new file mode 100644
index 000000000..f8904dd07
--- /dev/null
+++ b/src/lib/language.js
@@ -0,0 +1,14 @@
+import { useI18nStore } from 'src/stores/i18n.js'
+
+export const piniaLanguagePlugin = ({ store, options }) => {
+  if (store.$id === 'sync_config') {
+    store.$onAction(({ name, args }) => {
+      if (name === 'setPreference') {
+        const { path, value } = args[0]
+        if (path === 'simple.interfaceLanguage') {
+          useI18nStore().setLanguage(value)
+        }
+      }
+    })
+  }
+}
diff --git a/src/stores/i18n.js b/src/stores/i18n.js
index 4e7c7c5d3..a18b1d4d2 100644
--- a/src/stores/i18n.js
+++ b/src/stores/i18n.js
@@ -1,5 +1,14 @@
+import Cookies from 'js-cookie'
 import { defineStore } from 'pinia'
 
+import { useEmojiStore } from 'src/stores/emoji.js'
+import { useSyncConfigStore } from 'src/stores/sync_config.js'
+
+import messages from 'src/i18n/messages'
+import localeService from 'src/services/locale/locale.service.js'
+
+const BACKEND_LANGUAGE_COOKIE_NAME = 'userLanguage'
+
 export const useI18nStore = defineStore('i18n', {
   state: () => ({
     i18n: null,
@@ -10,5 +19,16 @@ export const useI18nStore = defineStore('i18n', {
         i18n: newI18n.global,
       })
     },
+    setLanguage(originalValue) {
+      const value =
+        originalValue || useSyncConfigStore().mergedConfig.interfaceLanguage
+
+      messages.setLanguage(this.i18n, value)
+      useEmojiStore().loadUnicodeEmojiData(value)
+      Cookies.set(
+        BACKEND_LANGUAGE_COOKIE_NAME,
+        localeService.internalToBackendLocaleMulti(value),
+      )
+    },
   },
 })