fix: translate the auth server's answer to a wrong email or password

A password sign-in refused with INVALID_EMAIL_OR_PASSWORD showed the server's English
message in every app, and a failed mobile sign-in without a message fell back to a
hard-coded English line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/mobile/src/modules/login/email.tsx

@@ -69,7 +69,11 @@ async function signInWithEmail(
       return false
     }
   } catch (error) {
-    Alert.alert(error instanceof Error ? error.message : "Unable to sign in")
+    Alert.alert(
+      error instanceof Error
+        ? error.message
+        : i18next.t("auth.error.sign_in_failed", { ns: "common" }),
+    )
     return false
   }
 

locales/common/en.json

@@ -3,6 +3,7 @@
   "app.copied_to_clipboard": "Copied to clipboard",
   "app.request_timeout": "The server took too long to respond. Please try again.",
   "auth.error.account_not_linked": "This email belongs to a Folo account that isn't verified yet. Sign in to it once with a magic link on app.folo.is (leave the password empty), then try this sign-in method again.",
+  "auth.error.invalid_email_or_password": "Incorrect email or password.",
   "auth.error.invalid_token": "This link is invalid or has expired. Please request a new one.",
   "auth.error.sign_in_failed": "Couldn't sign in. Please try again.",
   "auth.error.too_many_requests": "Too many requests. Please try again later.",

locales/common/fr-FR.json

@@ -3,6 +3,7 @@
   "app.copied_to_clipboard": "Copié dans le presse-papiers",
   "app.request_timeout": "Le serveur a mis trop de temps à répondre. Veuillez réessayer.",
   "auth.error.account_not_linked": "Cet email appartient à un compte Folo qui n'est pas encore vérifié. Connectez-vous-y une fois avec un lien magique sur app.folo.is (laissez le mot de passe vide), puis réessayez ce mode de connexion.",
+  "auth.error.invalid_email_or_password": "Email ou mot de passe incorrect.",
   "auth.error.invalid_token": "Ce lien est invalide ou a expiré. Veuillez en demander un nouveau.",
   "auth.error.sign_in_failed": "Connexion impossible. Veuillez réessayer.",
   "auth.error.too_many_requests": "Trop de requêtes. Veuillez réessayer plus tard.",

locales/common/ja.json

@@ -3,6 +3,7 @@
   "app.copied_to_clipboard": "クリップボードにコピーしました",
   "app.request_timeout": "サーバーの応答に時間がかかりすぎました。しばらくしてからもう一度お試しください。",
   "auth.error.account_not_linked": "このメールアドレスの Folo アカウントはまだ確認されていません。app.folo.is でマジックリンクを使って一度ログインしてから（パスワードは空欄のまま）、このログイン方法をもう一度お試しください。",
+  "auth.error.invalid_email_or_password": "メールアドレスまたはパスワードが正しくありません。",
   "auth.error.invalid_token": "このリンクは無効か、有効期限が切れています。新しいリンクをリクエストしてください。",
   "auth.error.sign_in_failed": "ログインできませんでした。もう一度お試しください。",
   "auth.error.too_many_requests": "リクエストが多すぎます。しばらくしてからもう一度お試しください。",

locales/common/zh-CN.json

@@ -3,6 +3,7 @@
   "app.copied_to_clipboard": "已复制到剪贴板",
   "app.request_timeout": "服务器响应超时，请稍后重试。",
   "auth.error.account_not_linked": "此邮箱对应的 Folo 账号尚未验证。请先在 app.folo.is 用魔法链接登录一次（密码留空），再使用这种登录方式。",
+  "auth.error.invalid_email_or_password": "邮箱或密码不正确。",
   "auth.error.invalid_token": "此链接无效或已过期，请重新获取。",
   "auth.error.sign_in_failed": "登录失败，请重试。",
   "auth.error.too_many_requests": "请求过于频繁，请稍后再试。",

locales/common/zh-TW.json

@@ -3,6 +3,7 @@
   "app.copied_to_clipboard": "已複製到剪貼簿",
   "app.request_timeout": "伺服器回應逾時，請稍後再試。",
   "auth.error.account_not_linked": "此電子信箱對應的 Folo 帳號尚未驗證。請先在 app.folo.is 用魔法連結登入一次（密碼留空），再使用這種登入方式。",
+  "auth.error.invalid_email_or_password": "電子信箱或密碼不正確。",
   "auth.error.invalid_token": "此連結無效或已過期，請重新取得。",
   "auth.error.sign_in_failed": "登入失敗，請再試一次。",
   "auth.error.too_many_requests": "請求過於頻繁，請稍後再試。",

packages/internal/utils/src/auth-error.test.ts

@@ -13,6 +13,9 @@ describe("getAuthErrorMessageKey", () => {
     expect(getAuthErrorMessageKey("INVALID_TOKEN")).toBe("auth.error.invalid_token")
     expect(getAuthErrorMessageKey("TOKEN_EXPIRED")).toBe("auth.error.invalid_token")
     expect(getAuthErrorMessageKey("account_not_linked")).toBe("auth.error.account_not_linked")
+    expect(getAuthErrorMessageKey("INVALID_EMAIL_OR_PASSWORD")).toBe(
+      "auth.error.invalid_email_or_password",
+    )
   })
 
   it("names none for any other code", () => {
@@ -60,6 +63,15 @@ describe("describeAuthError", () => {
     )
   })
 
+  it("translates a password sign-in the server refused for the email or the password", () => {
+    expect(
+      describeAuthError(
+        { code: "INVALID_EMAIL_OR_PASSWORD", message: "Invalid email or password", status: 401 },
+        translate,
+      ),
+    ).toBe("translated auth.error.invalid_email_or_password")
+  })
+
   it("keeps what the server said about anything else", () => {
     expect(
       describeAuthError(

packages/internal/utils/src/auth-error.ts

@@ -6,6 +6,8 @@
 const AUTH_ERROR_MESSAGE_KEYS = {
   // A provider's account for an email whose Folo account is not verified yet
   account_not_linked: "auth.error.account_not_linked",
+  // A password sign-in with an email that has no account, or with the wrong password
+  INVALID_EMAIL_OR_PASSWORD: "auth.error.invalid_email_or_password",
   // A sign-in or verification link that was used already, or is not one at all
   INVALID_TOKEN: "auth.error.invalid_token",
   TOKEN_EXPIRED: "auth.error.invalid_token",