No address step before signing in when there's only one mail server

The server's own page asks for the username, so with a single server the
sign-in page keeps only the own-device choice. With several servers the
address still comes first, since its domain picks the server. One new string,
in all nine catalogues.

web/src/locales/de.ts

@@ -1243,6 +1243,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "Die Lesebestätigung konnte nicht gesendet werden: {error}",
     "Could not sign in.": "Anmeldung fehlgeschlagen.",
     "You'll enter your password on your mail server's sign-in page.": "Ihr Passwort geben Sie auf der Anmeldeseite Ihres Mailservers ein.",
+    "You'll sign in on your mail server's own page.": "Sie melden sich auf der eigenen Seite Ihres Mailservers an.",
     "This sign-in didn't start in this browser. Try again.": "Diese Anmeldung wurde nicht in diesem Browser begonnen. Bitte versuchen Sie es erneut.",
     "The sign-in took too long. Try again.": "Die Anmeldung hat zu lange gedauert. Bitte versuchen Sie es erneut.",
     "Sign-in was cancelled.": "Die Anmeldung wurde abgebrochen.",

web/src/locales/es.ts

@@ -1216,6 +1216,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "No se pudo enviar la confirmación de lectura: {error}",
     "Could not sign in.": "No se pudo iniciar sesión.",
     "You'll enter your password on your mail server's sign-in page.": "Introducirá su contraseña en la página de inicio de sesión de su servidor de correo.",
+    "You'll sign in on your mail server's own page.": "Iniciará sesión en la propia página de su servidor de correo.",
     "This sign-in didn't start in this browser. Try again.": "Este inicio de sesión no empezó en este navegador. Inténtelo de nuevo.",
     "The sign-in took too long. Try again.": "El inicio de sesión tardó demasiado. Inténtelo de nuevo.",
     "Sign-in was cancelled.": "Se canceló el inicio de sesión.",

web/src/locales/fr.ts

@@ -1221,6 +1221,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "Impossible d’envoyer l’accusé de lecture : {error}",
     "Could not sign in.": "Connexion impossible.",
     "You'll enter your password on your mail server's sign-in page.": "Vous saisirez votre mot de passe sur la page de connexion de votre serveur de messagerie.",
+    "You'll sign in on your mail server's own page.": "Vous vous connecterez sur la page de votre serveur de messagerie.",
     "This sign-in didn't start in this browser. Try again.": "Cette connexion n’a pas commencé dans ce navigateur. Réessayez.",
     "The sign-in took too long. Try again.": "La connexion a pris trop de temps. Réessayez.",
     "Sign-in was cancelled.": "La connexion a été annulée.",

web/src/locales/ja.ts

@@ -1224,6 +1224,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "開封確認を送信できませんでした: {error}",
     "Could not sign in.": "サインインできませんでした。",
     "You'll enter your password on your mail server's sign-in page.": "パスワードはメールサーバーのサインインページで入力します。",
+    "You'll sign in on your mail server's own page.": "メールサーバー自身のページでサインインします。",
     "This sign-in didn't start in this browser. Try again.": "このサインインはこのブラウザーで開始されたものではありません。もう一度お試しください。",
     "The sign-in took too long. Try again.": "サインインに時間がかかりすぎました。もう一度お試しください。",
     "Sign-in was cancelled.": "サインインはキャンセルされました。",

web/src/locales/nl.ts

@@ -1214,6 +1214,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "De leesbevestiging kon niet worden verzonden: {error}",
     "Could not sign in.": "Aanmelden mislukt.",
     "You'll enter your password on your mail server's sign-in page.": "U voert uw wachtwoord in op de aanmeldpagina van uw mailserver.",
+    "You'll sign in on your mail server's own page.": "U meldt zich aan op de eigen pagina van uw mailserver.",
     "This sign-in didn't start in this browser. Try again.": "Deze aanmelding is niet in deze browser begonnen. Probeer het opnieuw.",
     "The sign-in took too long. Try again.": "Het aanmelden duurde te lang. Probeer het opnieuw.",
     "Sign-in was cancelled.": "Het aanmelden is geannuleerd.",

web/src/locales/pt-BR.ts

@@ -1219,6 +1219,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "Não foi possível enviar a confirmação de leitura: {error}",
     "Could not sign in.": "Não foi possível entrar.",
     "You'll enter your password on your mail server's sign-in page.": "Você vai digitar sua senha na página de entrada do seu servidor de e-mail.",
+    "You'll sign in on your mail server's own page.": "Você vai entrar na própria página do seu servidor de e-mail.",
     "This sign-in didn't start in this browser. Try again.": "Esta entrada não começou neste navegador. Tente de novo.",
     "The sign-in took too long. Try again.": "A entrada demorou demais. Tente de novo.",
     "Sign-in was cancelled.": "A entrada foi cancelada.",

web/src/locales/ru.ts

@@ -1218,6 +1218,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "Не удалось отправить уведомление о прочтении: {error}",
     "Could not sign in.": "Не удалось войти.",
     "You'll enter your password on your mail server's sign-in page.": "Пароль вводится на странице входа вашего почтового сервера.",
+    "You'll sign in on your mail server's own page.": "Вход выполняется на странице вашего почтового сервера.",
     "This sign-in didn't start in this browser. Try again.": "Этот вход начат не в этом браузере. Попробуйте ещё раз.",
     "The sign-in took too long. Try again.": "Вход занял слишком много времени. Попробуйте ещё раз.",
     "Sign-in was cancelled.": "Вход отменён.",

web/src/locales/uk.ts

@@ -1212,6 +1212,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "Не вдалося надіслати сповіщення про прочитання: {error}",
     "Could not sign in.": "Не вдалося увійти.",
     "You'll enter your password on your mail server's sign-in page.": "Пароль вводиться на сторінці входу вашого поштового сервера.",
+    "You'll sign in on your mail server's own page.": "Вхід виконується на сторінці вашого поштового сервера.",
     "This sign-in didn't start in this browser. Try again.": "Цей вхід розпочато не в цьому браузері. Спробуйте ще раз.",
     "The sign-in took too long. Try again.": "Вхід тривав занадто довго. Спробуйте ще раз.",
     "Sign-in was cancelled.": "Вхід скасовано.",

web/src/locales/zh-Hans.ts

@@ -1223,6 +1223,7 @@ export const catalog: Catalog = {
     "Could not send the receipt: {error}": "无法发送已读回执：{error}",
     "Could not sign in.": "无法登录。",
     "You'll enter your password on your mail server's sign-in page.": "您将在邮件服务器的登录页面上输入密码。",
+    "You'll sign in on your mail server's own page.": "您将在邮件服务器自己的页面上登录。",
     "This sign-in didn't start in this browser. Try again.": "此次登录不是在这个浏览器中发起的。请重试。",
     "The sign-in took too long. Try again.": "登录耗时过长。请重试。",
     "Sign-in was cancelled.": "登录已取消。",

web/src/views/Login.tsx

@@ -33,6 +33,8 @@ export function LoginPage() {
    * and the password form if it never does.
    */
   const [signIn, setSignIn] = useState<"oauth" | "password" | null>(null);
+  /* With "oauth" and one mail server, its page asks for the username: no address here. */
+  const [direct, setDirect] = useState(false);
   useEffect(() => {
     let live = true;
     fetch(withBase("/api/config"))
@@ -42,6 +44,7 @@ export function LoginPage() {
         if (c.sourceUrl) setSourceUrl(c.sourceUrl as string);
         if (typeof c.appName === "string" && c.appName.trim()) setAppName(c.appName.trim());
         setSignIn(c.signIn === "oauth" ? "oauth" : "password");
+        setDirect(c.signIn === "oauth" && c.signInDirect === true);
       })
       .catch(() => { /* the default stands */ })
       .finally(() => { if (live) setSignIn((m) => m ?? "password"); });
@@ -58,10 +61,10 @@ export function LoginPage() {
     e.preventDefault();
     if (signIn === "oauth") {
       // Off to the mail server's page, which asks for the password there.
-      if (!username.trim()) return;
+      if (!direct && !username.trim()) return;
       setBusy(true);
-      if (trustDevice) localStorage.setItem("ihasmail:lastUser", username.trim());
-      const params = new URLSearchParams({ username: username.trim(), ...(trustDevice ? { remember: "1" } : {}) });
+      if (trustDevice && !direct) localStorage.setItem("ihasmail:lastUser", username.trim());
+      const params = new URLSearchParams({ ...(direct ? {} : { username: username.trim() }), ...(trustDevice ? { remember: "1" } : {}) });
       window.location.assign(withBase(`/api/auth/oauth/start?${params}`));
       return;
     }
@@ -100,12 +103,18 @@ export function LoginPage() {
             {error}
           </div>
         )}
+        {!direct && (
         <div className="field">
           <label htmlFor="u">{t("Email or username")}</label>
           <input id="u" className="input" type="text" autoComplete="username" autoCapitalize="none" autoCorrect="off" spellCheck={false} value={username} onChange={(e) => setUsername(e.target.value)} autoFocus={!username} required />
         </div>
+        )}
         {signIn === "oauth" ? (
-          <p className="hint" style={{ marginBottom: 12 }}>{t("You'll enter your password on your mail server's sign-in page.")}</p>
+          <p className="hint" style={{ marginBottom: 12 }}>
+            {direct
+              ? t("You'll sign in on your mail server's own page.")
+              : t("You'll enter your password on your mail server's sign-in page.")}
+          </p>
         ) : (
         <div className="field">
           <label htmlFor="p">{t("Password")}</label>