diff --git a/apps/readest-app/public/locales/ar/translation.json b/apps/readest-app/public/locales/ar/translation.json
index 2b9aa9ec..4bba7cb9 100644
--- a/apps/readest-app/public/locales/ar/translation.json
+++ b/apps/readest-app/public/locales/ar/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "تبديل منطقة التقليب بالنقر",
   "No chapters detected.": "لم يتم التعرف على فصول.",
   "Failed to parse the EPUB file.": "فشل في تحليل ملف EPUB.",
-  "This book format is not supported.": "هذا تنسيق الكتاب غير مدعوم."
+  "This book format is not supported.": "هذا تنسيق الكتاب غير مدعوم.",
+  "Unable to fetch the translation. Please log in first and try again.": "تعذر جلب الترجمة. يرجى تسجيل الدخول أولاً ثم المحاولة مرة أخرى."
 }
diff --git a/apps/readest-app/public/locales/de/translation.json b/apps/readest-app/public/locales/de/translation.json
index de530f33..be6fa820 100644
--- a/apps/readest-app/public/locales/de/translation.json
+++ b/apps/readest-app/public/locales/de/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Klick-zu-Blättern-Bereich tauschen",
   "No chapters detected.": "Keine Kapitel erkannt.",
   "Failed to parse the EPUB file.": "Fehler beim Parsen der EPUB-Datei.",
-  "This book format is not supported.": "Dieses Buchformat wird nicht unterstützt."
+  "This book format is not supported.": "Dieses Buchformat wird nicht unterstützt.",
+  "Unable to fetch the translation. Please log in first and try again.": "Übersetzung konnte nicht abgerufen werden. Bitte zuerst anmelden und erneut versuchen."
 }
diff --git a/apps/readest-app/public/locales/el/translation.json b/apps/readest-app/public/locales/el/translation.json
index 88b29338..f78e1032 100644
--- a/apps/readest-app/public/locales/el/translation.json
+++ b/apps/readest-app/public/locales/el/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Ανταλλαγή περιοχής κλικ για γύρισμα σελίδας",
   "No chapters detected.": "Δεν εντοπίστηκαν κεφάλαια.",
   "Failed to parse the EPUB file.": "Αποτυχία ανάλυσης του αρχείου EPUB.",
-  "This book format is not supported.": "Αυτή η μορφή βιβλίου δεν υποστηρίζεται."
+  "This book format is not supported.": "Αυτή η μορφή βιβλίου δεν υποστηρίζεται.",
+  "Unable to fetch the translation. Please log in first and try again.": "Αδυναμία λήψης της μετάφρασης. Παρακαλώ συνδεθείτε πρώτα και δοκιμάστε ξανά."
 }
diff --git a/apps/readest-app/public/locales/es/translation.json b/apps/readest-app/public/locales/es/translation.json
index 5b922ded..ff77714e 100644
--- a/apps/readest-app/public/locales/es/translation.json
+++ b/apps/readest-app/public/locales/es/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Intercambiar área de clic para voltear",
   "No chapters detected.": "No se detectaron capítulos.",
   "Failed to parse the EPUB file.": "Error al analizar el archivo EPUB.",
-  "This book format is not supported.": "Este formato de libro no es compatible."
+  "This book format is not supported.": "Este formato de libro no es compatible.",
+  "Unable to fetch the translation. Please log in first and try again.": "No se puede obtener la traducción. Por favor, inicia sesión primero e inténtalo de nuevo."
 }
diff --git a/apps/readest-app/public/locales/fr/translation.json b/apps/readest-app/public/locales/fr/translation.json
index 4510cd98..4138ba28 100644
--- a/apps/readest-app/public/locales/fr/translation.json
+++ b/apps/readest-app/public/locales/fr/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Échanger la zone de clic pour tourner",
   "No chapters detected.": "Aucun chapitre détecté.",
   "Failed to parse the EPUB file.": "Échec de l'analyse du fichier EPUB.",
-  "This book format is not supported.": "Ce format de livre n'est pas pris en charge."
+  "This book format is not supported.": "Ce format de livre n'est pas pris en charge.",
+  "Unable to fetch the translation. Please log in first and try again.": "Impossible de récupérer la traduction. Veuillez d'abord vous connecter et réessayer."
 }
diff --git a/apps/readest-app/public/locales/hi/translation.json b/apps/readest-app/public/locales/hi/translation.json
index 1b34d4e8..f88e33f0 100644
--- a/apps/readest-app/public/locales/hi/translation.json
+++ b/apps/readest-app/public/locales/hi/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "क्लिक-टू-फ्लिप क्षेत्र स्वैप करें",
   "No chapters detected.": "कोई अध्याय नहीं मिला।",
   "Failed to parse the EPUB file.": "EPUB फ़ाइल को पार्स करने में विफल।",
-  "This book format is not supported.": "यह पुस्तक प्रारूप समर्थित नहीं है।"
+  "This book format is not supported.": "यह पुस्तक प्रारूप समर्थित नहीं है।",
+  "Unable to fetch the translation. Please log in first and try again.": "अनुवाद प्राप्त करने में असमर्थ। कृपया पहले लॉग इन करें और पुनः प्रयास करें।"
 }
diff --git a/apps/readest-app/public/locales/id/translation.json b/apps/readest-app/public/locales/id/translation.json
index 7bed02c4..ddc012ae 100644
--- a/apps/readest-app/public/locales/id/translation.json
+++ b/apps/readest-app/public/locales/id/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Tukar Area Klik untuk Membalik",
   "No chapters detected.": "Tidak ada bab yang terdeteksi.",
   "Failed to parse the EPUB file.": "Gagal mengurai file EPUB.",
-  "This book format is not supported.": "Format buku ini tidak didukung."
+  "This book format is not supported.": "Format buku ini tidak didukung.",
+  "Unable to fetch the translation. Please log in first and try again.": "Tidak dapat mengambil terjemahan. Silakan masuk terlebih dahulu dan coba lagi."
 }
diff --git a/apps/readest-app/public/locales/it/translation.json b/apps/readest-app/public/locales/it/translation.json
index 4d230306..3e3809c6 100644
--- a/apps/readest-app/public/locales/it/translation.json
+++ b/apps/readest-app/public/locales/it/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Scambia area click per voltare pagina",
   "No chapters detected.": "Nessun capitolo rilevato.",
   "Failed to parse the EPUB file.": "Impossibile analizzare il file EPUB.",
-  "This book format is not supported.": "Questo formato di libro non è supportato."
+  "This book format is not supported.": "Questo formato di libro non è supportato.",
+  "Unable to fetch the translation. Please log in first and try again.": "Impossibile recuperare la traduzione. Accedi prima e riprova."
 }
diff --git a/apps/readest-app/public/locales/ja/translation.json b/apps/readest-app/public/locales/ja/translation.json
index 212ea3c4..c1cdcfd4 100644
--- a/apps/readest-app/public/locales/ja/translation.json
+++ b/apps/readest-app/public/locales/ja/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "クリックめくりエリアを入れ替え",
   "No chapters detected.": "章が検出されません。",
   "Failed to parse the EPUB file.": "EPUBファイルの解析に失敗しました。",
-  "This book format is not supported.": "この書籍形式はサポートされていません。"
+  "This book format is not supported.": "この書籍形式はサポートされていません。",
+  "Unable to fetch the translation. Please log in first and try again.": "翻訳を取得できません。まずログインして再試行してください。"
 }
diff --git a/apps/readest-app/public/locales/ko/translation.json b/apps/readest-app/public/locales/ko/translation.json
index 4d73f631..857baf21 100644
--- a/apps/readest-app/public/locales/ko/translation.json
+++ b/apps/readest-app/public/locales/ko/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "클릭-뒤집기 영역 교환",
   "No chapters detected.": "장 발견되지 않음.",
   "Failed to parse the EPUB file.": "EPUB 파일 구문 분석 실패.",
-  "This book format is not supported.": "이 책 형식은 지원되지 않습니다."
+  "This book format is not supported.": "이 책 형식은 지원되지 않습니다.",
+  "Unable to fetch the translation. Please log in first and try again.": "번역을 가져올 수 없습니다. 먼저 로그인하고 다시 시도하세요."
 }
diff --git a/apps/readest-app/public/locales/pl/translation.json b/apps/readest-app/public/locales/pl/translation.json
index aa4cbe58..bcabfcc3 100644
--- a/apps/readest-app/public/locales/pl/translation.json
+++ b/apps/readest-app/public/locales/pl/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Zamień obszar kliknięcia na przewracanie",
   "No chapters detected.": "Nie wykryto rozdziałów.",
   "Failed to parse the EPUB file.": "Nie udało się przeanalizować pliku EPUB.",
-  "This book format is not supported.": "Ten format książki nie jest obsługiwany."
+  "This book format is not supported.": "Ten format książki nie jest obsługiwany.",
+  "Unable to fetch the translation. Please log in first and try again.": "Nie można pobrać tłumaczenia. Proszę najpierw się zalogować i spróbować ponownie."
 }
diff --git a/apps/readest-app/public/locales/pt/translation.json b/apps/readest-app/public/locales/pt/translation.json
index 49c7eab6..a993da36 100644
--- a/apps/readest-app/public/locales/pt/translation.json
+++ b/apps/readest-app/public/locales/pt/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Trocar Área de Clique para Virar",
   "No chapters detected.": "Nenhum capítulo detectado.",
   "Failed to parse the EPUB file.": "Falha ao analisar o arquivo EPUB.",
-  "This book format is not supported.": "Este formato de livro não é suportado."
+  "This book format is not supported.": "Este formato de livro não é suportado.",
+  "Unable to fetch the translation. Please log in first and try again.": "Não foi possível buscar a tradução. Faça login primeiro e tente novamente."
 }
diff --git a/apps/readest-app/public/locales/ru/translation.json b/apps/readest-app/public/locales/ru/translation.json
index 5873b5c3..312c58d4 100644
--- a/apps/readest-app/public/locales/ru/translation.json
+++ b/apps/readest-app/public/locales/ru/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Переключить область клика для переворота",
   "No chapters detected.": "Не обнаружено глав.",
   "Failed to parse the EPUB file.": "Не удалось разобрать файл EPUB.",
-  "This book format is not supported.": "Этот формат книги не поддерживается."
+  "This book format is not supported.": "Этот формат книги не поддерживается.",
+  "Unable to fetch the translation. Please log in first and try again.": "Не удалось получить перевод. Пожалуйста, войдите в систему и попробуйте снова."
 }
diff --git a/apps/readest-app/public/locales/tr/translation.json b/apps/readest-app/public/locales/tr/translation.json
index 6c636de1..ec06b469 100644
--- a/apps/readest-app/public/locales/tr/translation.json
+++ b/apps/readest-app/public/locales/tr/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Tıkla-Çevir Alanını Değiştir",
   "No chapters detected.": "Bölüm bulunamadı.",
   "Failed to parse the EPUB file.": "EPUB dosyası ayrıştırılamadı.",
-  "This book format is not supported.": "Bu kitap formatı desteklenmiyor."
+  "This book format is not supported.": "Bu kitap formatı desteklenmiyor.",
+  "Unable to fetch the translation. Please log in first and try again.": "Çeviri alınamıyor. Lütfen önce giriş yapın ve tekrar deneyin."
 }
diff --git a/apps/readest-app/public/locales/uk/translation.json b/apps/readest-app/public/locales/uk/translation.json
index 5c43e845..38ca096e 100644
--- a/apps/readest-app/public/locales/uk/translation.json
+++ b/apps/readest-app/public/locales/uk/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Поміняти місцями область кліку для перевороту",
   "No chapters detected.": "Не виявлено жодного розділу.",
   "Failed to parse the EPUB file.": "Не вдалося розібрати файл EPUB.",
-  "This book format is not supported.": "Цей формат книги не підтримується."
+  "This book format is not supported.": "Цей формат книги не підтримується.",
+  "Unable to fetch the translation. Please log in first and try again.": "Не вдалося отримати переклад. Будь ласка, спочатку увійдіть у систему та спробуйте ще раз."
 }
diff --git a/apps/readest-app/public/locales/vi/translation.json b/apps/readest-app/public/locales/vi/translation.json
index fa5032fe..f1df8ff6 100644
--- a/apps/readest-app/public/locales/vi/translation.json
+++ b/apps/readest-app/public/locales/vi/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "Hoán đổi khu vực nhấp để lật trang",
   "No chapters detected.": "Không phát hiện thấy chương nào.",
   "Failed to parse the EPUB file.": "Không thể phân tích tệp EPUB.",
-  "This book format is not supported.": "Định dạng sách này không được hỗ trợ."
+  "This book format is not supported.": "Định dạng sách này không được hỗ trợ.",
+  "Unable to fetch the translation. Please log in first and try again.": "Không thể tải dịch vụ. Vui lòng đăng nhập trước và thử lại."
 }
diff --git a/apps/readest-app/public/locales/zh-CN/translation.json b/apps/readest-app/public/locales/zh-CN/translation.json
index 3a300887..d6f93e48 100644
--- a/apps/readest-app/public/locales/zh-CN/translation.json
+++ b/apps/readest-app/public/locales/zh-CN/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "交换点击翻页区域",
   "No chapters detected.": "未检测到章节。",
   "Failed to parse the EPUB file.": "无法解析 EPUB 文件。",
-  "This book format is not supported.": "不支持此书籍格式。"
+  "This book format is not supported.": "不支持此书籍格式。",
+  "Unable to fetch the translation. Please log in first and try again.": "无法获取翻译。请登录后重试。"
 }
diff --git a/apps/readest-app/public/locales/zh-TW/translation.json b/apps/readest-app/public/locales/zh-TW/translation.json
index 4541e156..ac4155cb 100644
--- a/apps/readest-app/public/locales/zh-TW/translation.json
+++ b/apps/readest-app/public/locales/zh-TW/translation.json
@@ -264,5 +264,6 @@
   "Swap Click-to-Flip Area": "交換點擊翻頁區域",
   "No chapters detected.": "未檢測到章節。",
   "Failed to parse the EPUB file.": "無法解析 EPUB 文件。",
-  "This book format is not supported.": "不支援此書籍格式。"
+  "This book format is not supported.": "不支援此書籍格式。",
+  "Unable to fetch the translation. Please log in first and try again.": "無法獲取翻譯。請先登入然後重試。"
 }
diff --git a/apps/readest-app/src/app/reader/components/annotator/DeepLPopup.tsx b/apps/readest-app/src/app/reader/components/annotator/DeepLPopup.tsx
index a666ac06..d8ed4aa7 100644
--- a/apps/readest-app/src/app/reader/components/annotator/DeepLPopup.tsx
+++ b/apps/readest-app/src/app/reader/components/annotator/DeepLPopup.tsx
@@ -103,7 +103,11 @@ const DeepLPopup: React.FC<DeepLPopupProps> = ({
         setTranslation(translatedText);
       } catch (err) {
         console.error(err);
-        setError(_('Unable to fetch the translation. Try again later.'));
+        if (!token) {
+          setError(_('Unable to fetch the translation. Please log in first and try again.'));
+        } else {
+          setError(_('Unable to fetch the translation. Try again later.'));
+        }
       } finally {
         setLoading(false);
       }
diff --git a/apps/readest-app/src/pages/api/deepl/translate.ts b/apps/readest-app/src/pages/api/deepl/translate.ts
index 592fae76..efd0626c 100644
--- a/apps/readest-app/src/pages/api/deepl/translate.ts
+++ b/apps/readest-app/src/pages/api/deepl/translate.ts
@@ -26,6 +26,12 @@ const getDeepLAPIKey = (keys: string | undefined) => {
 };
 
 const handler = async (req: NextApiRequest, res: NextApiResponse) => {
+  await runMiddleware(req, res, corsAllMethods);
+
+  if (req.method !== 'POST') {
+    return res.status(405).json({ error: 'Method not allowed' });
+  }
+
   const { user, token } = await getUserAndToken(req.headers['authorization']);
   const { DEEPL_PRO_API, DEEPL_FREE_API } = process.env;
   const deepFreeApiUrl = DEEPL_FREE_API || DEFAULT_DEEPL_FREE_API;
@@ -44,8 +50,6 @@ const handler = async (req: NextApiRequest, res: NextApiResponse) => {
       ? getDeepLAPIKey(process.env['DEEPL_PRO_API_KEYS'])
       : getDeepLAPIKey(process.env['DEEPL_FREE_API_KEYS']);
 
-  await runMiddleware(req, res, corsAllMethods);
-
   const {
     text,
     source_lang: sourceLang = 'auto',
@@ -61,7 +65,7 @@ const handler = async (req: NextApiRequest, res: NextApiResponse) => {
           'x-fingerprint': process.env['DEEPL_X_FINGERPRINT'] || '',
           'Content-Type': 'application/json',
         },
-        body: req.method === 'POST' ? JSON.stringify(req.body) : undefined,
+        body: JSON.stringify(req.body),
       });
       res.status(response.status);
       res.json(await response.json());