diff --git a/.github/crowdin.yml b/.github/crowdin.yml
new file mode 100644
index 0000000..deb1782
--- /dev/null
+++ b/.github/crowdin.yml
@@ -0,0 +1,12 @@
+project_id_env: "CROWDIN_PROJECT_ID"
+api_token_env: "CROWDIN_PERSONAL_TOKEN"
+base_path: "../"
+preserve_hierarchy: true
+files: [
+  {
+    source: "/src/main/resources/assets/viaproxy/language/en_US.properties",
+    translation: "/src/main/resources/assets/viaproxy/language/%locale_with_underscore%.properties",
+    escape_quotes: 0,
+    escape_special_characters: 0
+  }
+]
diff --git a/.github/workflows/crowdin-sync.yml b/.github/workflows/crowdin-sync.yml
new file mode 100644
index 0000000..6ab8e96
--- /dev/null
+++ b/.github/workflows/crowdin-sync.yml
@@ -0,0 +1,30 @@
+name: crowdin-sync
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  synchronize-with-crowdin:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Crowdin Sync
+        uses: crowdin/github-action@v2
+        with:
+          config: .github/crowdin.yml
+          upload_sources: true
+          download_translations: true
+          localization_branch_name: l10n_crowdin_translations
+          create_pull_request: true
+          pull_request_base_branch_name: main
+          pull_request_title: "New Crowdin Translations"
+          pull_request_body: "New Crowdin translations by [Crowdin GH Action](https://github.com/crowdin/github-action)"
+          commit_message: "[ci skip] Updated translations from Crowdin"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+          CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}
diff --git a/src/main/java/net/raphimc/viaproxy/ui/I18n.java b/src/main/java/net/raphimc/viaproxy/ui/I18n.java
index 56927b8..8706246 100644
--- a/src/main/java/net/raphimc/viaproxy/ui/I18n.java
+++ b/src/main/java/net/raphimc/viaproxy/ui/I18n.java
@@ -42,6 +42,7 @@ public class I18n {
             for (Map.Entry<Path, byte[]> entry : FileSystemUtil.getFilesInDirectory("assets/viaproxy/language").entrySet()) {
                 final Properties properties = new Properties();
                 properties.load(new InputStreamReader(new ByteArrayInputStream(entry.getValue()), StandardCharsets.UTF_8));
+                if (properties.isEmpty()) continue;
                 LOCALES.put(entry.getKey().getFileName().toString().replace(".properties", ""), properties);
             }
         } catch (Throwable e) {
diff --git a/src/main/resources/assets/viaproxy/language/de_DE.properties b/src/main/resources/assets/viaproxy/language/de_DE.properties
index 71b9acc..c6fef16 100644
--- a/src/main/resources/assets/viaproxy/language/de_DE.properties
+++ b/src/main/resources/assets/viaproxy/language/de_DE.properties
@@ -86,6 +86,8 @@ tab.ui_settings.name=Benutzeroberflächeneinstellungen
 tab.ui_settings.language.label=Sprache:
 tab.ui_settings.language.completion=%s übersetzt
 tab.ui_settings.language.success=Die Sprache wurde zu %s (%s) geändert. ViaProxy startet jetzt neu!
+tab.ui_settings.crowdin.info=Fehlt deine Sprache oder ist sie unvollständig? Hilf uns ViaProxy auf Crowdin zu übersetzen!
+tab.ui_settings.crowdin.link=Klick hier um Crowdin zu öffnen
 popup.login_account.title=Konto hinzufügen
 popup.login_account.instructions.browser=Bitte öffne folgende URL in deinem Browser:
 popup.login_account.instructions.close=Das Popup schließt sich automatisch, nachdem du angemeldet wurdest.
@@ -93,5 +95,3 @@ popup.download.title=Lade herunter...
 popup.update.info=Du verwendest eine alte Version von ViaProxy!\nAktuelle Version: %s\nNeueste Version: %s
 popup.update.question=Möchtest du aktualisieren?
 popup.update.success=Die neueste Version wurde heruntergeladen. ViaProxy startet jetzt neu!
-tab.ui_settings.crowdin.info=Fehlt deine Sprache oder ist sie unvollständig? Hilf uns ViaProxy auf Crowdin zu übersetzen!
-tab.ui_settings.crowdin.link=Klick hier um Crowdin zu öffnen
diff --git a/src/main/resources/assets/viaproxy/language/en_US.properties b/src/main/resources/assets/viaproxy/language/en_US.properties
index bafa0c3..09652fa 100644
--- a/src/main/resources/assets/viaproxy/language/en_US.properties
+++ b/src/main/resources/assets/viaproxy/language/en_US.properties
@@ -86,6 +86,8 @@ tab.ui_settings.name=UI Settings
 tab.ui_settings.language.label=Language:
 tab.ui_settings.language.completion=%s translated
 tab.ui_settings.language.success=Language changed to %s (%s). ViaProxy will now restart!
+tab.ui_settings.crowdin.info=Is your language missing or incomplete? Help us to translate ViaProxy on Crowdin!
+tab.ui_settings.crowdin.link=Click here to go to Crowdin
 popup.login_account.title=Add Account
 popup.login_account.instructions.browser=Please open the following URL in your browser:
 popup.login_account.instructions.close=The popup will close automatically after you have been logged in.
@@ -93,5 +95,3 @@ popup.download.title=Downloading...
 popup.update.info=You are running an outdated version of ViaProxy!\nCurrent version: %s\nLatest version: %s
 popup.update.question=Do you want to update?
 popup.update.success=Downloaded the latest version of ViaProxy. ViaProxy will now restart!
-tab.ui_settings.crowdin.info=Is your language missing or incomplete? Help us to translate ViaProxy on Crowdin!
-tab.ui_settings.crowdin.link=Click here to go to Crowdin
diff --git a/src/main/resources/assets/viaproxy/language/ko_KR.properties b/src/main/resources/assets/viaproxy/language/ko_KR.properties
index 0000c77..c6d045e 100644
--- a/src/main/resources/assets/viaproxy/language/ko_KR.properties
+++ b/src/main/resources/assets/viaproxy/language/ko_KR.properties
@@ -86,6 +86,8 @@ tab.ui_settings.name=UI 설정
 tab.ui_settings.language.label=언어 선택:
 tab.ui_settings.language.completion=%s 번역됨
 tab.ui_settings.language.success=%s (%s)으로 언어 변경에 성공했습니다. ViaProxy가 곧 재시작합니다.
+tab.ui_settings.crowdin.info=언어가 없거나 미완성되었나요? Crowdin에서 ViaProxy 번역에 도움을 주실 수 있어요!
+tab.ui_settings.crowdin.link=클릭해서 Crowdin 가기
 popup.login_account.title=계정 추가
 popup.login_account.instructions.browser=브라우저에서 이 링크를 열어주세요:
 popup.login_account.instructions.close=이 창은 당신이 로그인한 뒤 자동으로 닫힙니다.
@@ -93,5 +95,3 @@ popup.download.title=다운로드 중...
 popup.update.info=ViaProxy의 구버전을 사용하고 있습니다!\n현재 버전: %s\n최신 버전: %s
 popup.update.question=업데이트 하시겠습니까?
 popup.update.success=ViaProxy 최신 버전이 다운로드되었습니다. ViaProxy가 곧 재시작합니다.
-tab.ui_settings.crowdin.info=언어가 없거나 미완성되었나요? Crowdin에서 ViaProxy 번역에 도움을 주실 수 있어요!
-tab.ui_settings.crowdin.link=클릭해서 Crowdin 가기
diff --git a/src/main/resources/assets/viaproxy/language/zh_CN.properties b/src/main/resources/assets/viaproxy/language/zh_CN.properties
index 3b1bf9d..8d8bc91 100644
--- a/src/main/resources/assets/viaproxy/language/zh_CN.properties
+++ b/src/main/resources/assets/viaproxy/language/zh_CN.properties
@@ -86,6 +86,8 @@ tab.ui_settings.name=界面设置
 tab.ui_settings.language.label=语言：
 tab.ui_settings.language.completion=已翻译%s
 tab.ui_settings.language.success=语言已更改为%s（%s）。ViaProxy即将重新启动！
+tab.ui_settings.crowdin.info=你的语言是否缺失或不完整？帮助我们在Crowdin上翻译 ViaProxy！
+tab.ui_settings.crowdin.link=单击此处前往Crowdin
 popup.login_account.title=添加账户
 popup.login_account.instructions.browser=请在浏览器中打开以下URL：
 popup.login_account.instructions.close=登录后，弹窗将自动关闭。
@@ -93,5 +95,3 @@ popup.download.title=正在下载…
 popup.update.info=你正在使用过时的ViaProxy版本！\n当前版本：%s\n最新版本：%s
 popup.update.question=是否更新？
 popup.update.success=已下载最新版本的ViaProxy。ViaProxy即将重新启动！
-tab.ui_settings.crowdin.info=你的语言是否缺失或不完整？帮助我们在Crowdin上翻译 ViaProxy！
-tab.ui_settings.crowdin.link=单击此处前往Crowdin
diff --git a/src/main/resources/assets/viaproxy/language/zh_TW.properties b/src/main/resources/assets/viaproxy/language/zh_TW.properties
index 54a7f1c..3bfbdaa 100644
--- a/src/main/resources/assets/viaproxy/language/zh_TW.properties
+++ b/src/main/resources/assets/viaproxy/language/zh_TW.properties
@@ -86,6 +86,8 @@ tab.ui_settings.name=介面
 tab.ui_settings.language.label=語言：
 tab.ui_settings.language.completion=已翻譯 %s
 tab.ui_settings.language.success=語言已變更為%s（%s）。ViaProxy 即將重新啟動！
+tab.ui_settings.crowdin.info=你使用的語言有缺失嗎? 在Crowdin上幫助ViaProxy翻譯吧!
+tab.ui_settings.crowdin.link=點這裡前往Crowdin
 popup.login_account.title=新增帳號
 popup.login_account.instructions.browser=請在瀏覽器中開啟以下 URL：
 popup.login_account.instructions.close=登入後，彈出式視窗將自動關閉。
@@ -93,5 +95,3 @@ popup.download.title=正在下載...
 popup.update.info=你正在使用的 ViaProxy 版本太舊！\n目前版本：%s\n最新版本：%s
 popup.update.question=你想要更新嗎？
 popup.update.success=已下載 ViaProxy 的最新版本。ViaProxy 即將重新啟動！
-tab.ui_settings.crowdin.info=你使用的語言有缺失嗎? 在Crowdin上幫助ViaProxy翻譯吧!
-tab.ui_settings.crowdin.link=點這裡前往Crowdin