Fix: localize reply/forward quote header incl. sender address

The reply/forward quote header was always emitted in English ("On {date},
{from} wrote:", "---------- Forwarded message ----------", From/Date/Subject)
regardless of UI language, in both the main path (lib/quote-header.ts) and the
composer's inline fallback. quote-header.ts now takes an optional localized
QuoteHeaderLabels set (English defaults preserved for back-compat); page.tsx
builds it from a new quote_header message namespace, and the composer fallback
uses the same keys. Added the quote_header namespace to all 17 locales.

Also folds in the forward-sender-address fix: the forward "From:" line now
shows the full "Name <email>" like every mail client (the reply line keeps the
bare name, which reads naturally in "On … wrote:").

app/(main)/[locale]/page.tsx

@@ -81,6 +81,7 @@ const SCHEDULED_MAILBOX_ID = '__scheduled__';
 export default function Home() {
   const t = useTranslations();
   const tCommon = useTranslations('common');
+  const tQuote = useTranslations('quote_header');
   const { appName } = useConfig();
   const mailLayout = useSettingsStore((state) => state.mailLayout);
   const [showComposer, setShowComposer] = useState(false);
@@ -1212,13 +1213,20 @@ export default function Home() {
         locale: useLocaleStore.getState().locale,
         timeFormat: useSettingsStore.getState().timeFormat,
         unknownLabel: tCommon('unknown'),
+        labels: {
+          formatReplyLine: (vars) => tQuote('reply_line', vars),
+          forwardedSeparator: tQuote('forwarded_separator'),
+          fromLabel: tQuote('from_label'),
+          dateLabel: tQuote('date_label'),
+          subjectLabel: tQuote('subject_label'),
+        },
       });
       setComposerQuoteHeader(header);
     } catch (err) {
       console.warn('[quote-header] plugin transform failed; using default', err);
       setComposerQuoteHeader(null);
     }
-  }, [tCommon]);
+  }, [tCommon, tQuote]);
 
   // Force a clean composer remount on every fresh entry point so prior
   // compose state can't bleed into the new session (#329 C). The composer is

components/email/email-composer.tsx

@@ -196,6 +196,7 @@ export function EmailComposer({
 }: EmailComposerProps) {
   const t = useTranslations('email_composer');
   const tCommon = useTranslations('common');
+  const tQuote = useTranslations('quote_header');
   const timeFormat = useSettingsStore((state) => state.timeFormat);
   const plainTextMode = useSettingsStore((state) => state.plainTextMode);
   const subAddressDelimiter = useSettingsStore((state) => state.subAddressDelimiter);
@@ -291,6 +292,13 @@ export function EmailComposer({
       const date = replyTo.receivedAt ? formatDateTime(replyTo.receivedAt, timeFormat, { weekday: 'short', year: 'numeric', month: 'short', day: 'numeric' }) : "";
       const from = replyTo.from?.[0];
       const fromStr = from ? `${from.name || from.email}` : tCommon('unknown');
+      // Forward "From:" shows the full sender incl. address; reply line keeps
+      // the bare name (reads naturally in the localized "On … wrote:" line).
+      const fromStrFull = from
+        ? (from.name && from.email && from.name !== from.email
+            ? `${from.name} <${from.email}>`
+            : (from.email || from.name || tCommon('unknown')))
+        : tCommon('unknown');
 
       const originalText = replyTo.body || (replyTo.htmlBody ? htmlToPlainText(replyTo.htmlBody) : '');
       const quotedText = originalText.split('\n').map(line => `> ${line}`).join('\n');
@@ -311,9 +319,9 @@ export function EmailComposer({
       }
 
       if (mode === 'forward') {
-        return `${prefix}${signatureBlock}\n\n---------- Forwarded message ----------\nFrom: ${fromStr}\nDate: ${date}\nSubject: ${replyTo.subject || ''}\n\n${originalText}`;
+        return `${prefix}${signatureBlock}\n\n${tQuote('forwarded_separator')}\n${tQuote('from_label')}: ${fromStrFull}\n${tQuote('date_label')}: ${date}\n${tQuote('subject_label')}: ${replyTo.subject || ''}\n\n${originalText}`;
       } else if (mode === 'reply' || mode === 'replyAll') {
-        return `${prefix}${signatureBlock}\n\nOn ${date}, ${fromStr} wrote:\n${quotedText}`;
+        return `${prefix}${signatureBlock}\n\n${tQuote('reply_line', { date, from: fromStr })}\n${quotedText}`;
       }
       return prefix;
     }
@@ -336,6 +344,11 @@ export function EmailComposer({
     const date = replyTo.receivedAt ? formatDateTime(replyTo.receivedAt, timeFormat, { weekday: 'short', year: 'numeric', month: 'short', day: 'numeric' }) : "";
     const from = replyTo.from?.[0];
     const fromStr = from ? `${from.name || from.email}` : tCommon('unknown');
+    const fromStrFull = from
+      ? (from.name && from.email && from.name !== from.email
+          ? `${from.name} <${from.email}>`
+          : (from.email || from.name || tCommon('unknown')))
+      : tCommon('unknown');
 
     const signatureBlock = buildEmbeddedSignatureHtml(initialSignatureIdentity, {
       embed: shouldEmbedSignatureAboveQuote,
@@ -359,8 +372,8 @@ export function EmailComposer({
     // Build quoted content as HTML
     if (replyTo.htmlBody && (mode === 'reply' || mode === 'replyAll' || mode === 'forward')) {
       const quoteHeader = mode === 'forward'
-        ? `---------- Forwarded message ----------<br>From: ${fromStr}<br>Date: ${date}<br>Subject: ${replyTo.subject || ''}<br><br>`
-        : `On ${date}, ${fromStr} wrote:<br>`;
+        ? `${tQuote('forwarded_separator')}<br>${tQuote('from_label')}: ${fromStrFull}<br>${tQuote('date_label')}: ${date}<br>${tQuote('subject_label')}: ${replyTo.subject || ''}<br><br>`
+        : `${tQuote('reply_line', { date, from: fromStr })}<br>`;
       // cid: image refs are rewritten so they render in the editor (browsers
       // can't fetch cid: URLs); see useEffect below for the data-URL backfill.
       const quotedHtml = rewriteCidImagesForEditor(replyTo.htmlBody);
@@ -370,9 +383,9 @@ export function EmailComposer({
     if (replyTo.body) {
       const escapedOriginal = replyTo.body.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br>');
       if (mode === 'forward') {
-        return `${prefix}${signatureBlock}<br><br>---------- Forwarded message ----------<br>From: ${fromStr}<br>Date: ${date}<br>Subject: ${replyTo.subject || ''}<br><br>${escapedOriginal}`;
+        return `${prefix}${signatureBlock}<br><br>${tQuote('forwarded_separator')}<br>${tQuote('from_label')}: ${fromStrFull}<br>${tQuote('date_label')}: ${date}<br>${tQuote('subject_label')}: ${replyTo.subject || ''}<br><br>${escapedOriginal}`;
       } else if (mode === 'reply' || mode === 'replyAll') {
-        return `${prefix}${signatureBlock}<br><br>On ${date}, ${fromStr} wrote:<br><blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${escapedOriginal}</blockquote>`;
+        return `${prefix}${signatureBlock}<br><br>${tQuote('reply_line', { date, from: fromStr })}<br><blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${escapedOriginal}</blockquote>`;
       }
     }
     return prefix;

lib/quote-header.ts

@@ -10,6 +10,17 @@ import { formatDateTime } from "@/lib/utils";
 import { emailHooks } from "@/lib/plugin-hooks";
 import type { QuoteHeader, QuoteHeaderContext } from "@/lib/plugin-types";
 
+// Localized label set the caller passes in. Labels live on the client where
+// useTranslations is available; this module stays framework-agnostic.
+export interface QuoteHeaderLabels {
+  /** ICU-formatted reply line, e.g. "On {date}, {from} wrote:" with placeholders already substituted. */
+  formatReplyLine: (vars: { date: string; from: string }) => string;
+  forwardedSeparator: string;
+  fromLabel: string;
+  dateLabel: string;
+  subjectLabel: string;
+}
+
 interface BuildArgs {
   mode: "reply" | "replyAll" | "forward";
   email: {
@@ -24,10 +35,24 @@ interface BuildArgs {
   locale: string;
   timeFormat: "12h" | "24h";
   unknownLabel: string;
+  /**
+   * Localized labels. Optional for backward compatibility; falls back to
+   * English (matching the original hardcoded behaviour) when not supplied.
+   */
+  labels?: QuoteHeaderLabels;
 }
 
+const DEFAULT_LABELS: QuoteHeaderLabels = {
+  formatReplyLine: ({ date, from }) => `On ${date}, ${from} wrote:`,
+  forwardedSeparator: "---------- Forwarded message ----------",
+  fromLabel: "From",
+  dateLabel: "Date",
+  subjectLabel: "Subject",
+};
+
 function defaultHeader(args: BuildArgs): QuoteHeader {
   const { mode, email, timeFormat, unknownLabel } = args;
+  const labels = args.labels ?? DEFAULT_LABELS;
   const date = email.receivedAt
     ? formatDateTime(email.receivedAt, timeFormat, {
         weekday: "short",
@@ -38,16 +63,25 @@ function defaultHeader(args: BuildArgs): QuoteHeader {
     : "";
   const from = email.from?.[0];
   const fromStr = from ? `${from.name || from.email}` : unknownLabel;
+  // Forward header "From:" shows the full sender incl. address ("Name
+  // <email>"), like every mail client. The reply line keeps the bare name
+  // (reads more naturally in "On … wrote:").
+  const fromStrFull = from
+    ? (from.name && from.email && from.name !== from.email
+        ? `${from.name} <${from.email}>`
+        : (from.email || from.name || unknownLabel))
+    : unknownLabel;
   const subject = email.subject || "";
 
   if (mode === "forward") {
-    const text = `---------- Forwarded message ----------\nFrom: ${fromStr}\nDate: ${date}\nSubject: ${subject}\n`;
-    const html = `<div>---------- Forwarded message ----------<br>From: ${fromStr}<br>Date: ${date}<br>Subject: ${subject}<br><br></div>`;
+    const text = `${labels.forwardedSeparator}\n${labels.fromLabel}: ${fromStrFull}\n${labels.dateLabel}: ${date}\n${labels.subjectLabel}: ${subject}\n`;
+    const html = `<div>${labels.forwardedSeparator}<br>${labels.fromLabel}: ${fromStrFull}<br>${labels.dateLabel}: ${date}<br>${labels.subjectLabel}: ${subject}<br><br></div>`;
     return { html, text, wrapInBlockquote: false };
   }
 
-  const text = `On ${date}, ${fromStr} wrote:\n`;
-  const html = `<div>On ${date}, ${fromStr} wrote:<br></div>`;
+  const replyLine = labels.formatReplyLine({ date, from: fromStr });
+  const text = `${replyLine}\n`;
+  const html = `<div>${replyLine}<br></div>`;
   return { html, text, wrapInBlockquote: true };
 }
 

locales/cs/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Dne {date} napsal(a) {from}:",
+    "forwarded_separator": "---------- Přeposlaná zpráva ----------",
+    "from_label": "Od",
+    "date_label": "Datum",
+    "subject_label": "Předmět"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "E-mail",

locales/da/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Den {date} skrev {from}:",
+    "forwarded_separator": "---------- Videresendt besked ----------",
+    "from_label": "Fra",
+    "date_label": "Dato",
+    "subject_label": "Emne"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "Email",

locales/de/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Am {date} schrieb {from}:",
+    "forwarded_separator": "---------- Weitergeleitete Nachricht ----------",
+    "from_label": "Von",
+    "date_label": "Datum",
+    "subject_label": "Betreff"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "E-Mail",

locales/en/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "On {date}, {from} wrote:",
+    "forwarded_separator": "---------- Forwarded message ----------",
+    "from_label": "From",
+    "date_label": "Date",
+    "subject_label": "Subject"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "Email",

locales/es/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "El {date}, {from} escribió:",
+    "forwarded_separator": "---------- Mensaje reenviado ----------",
+    "from_label": "De",
+    "date_label": "Fecha",
+    "subject_label": "Asunto"
+  },
   "login": {
     "title": "Correo Web",
     "username_label": "Correo electrónico",

locales/fr/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Le {date}, {from} a écrit :",
+    "forwarded_separator": "---------- Message transféré ----------",
+    "from_label": "De",
+    "date_label": "Date",
+    "subject_label": "Sujet"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "Email",

locales/it/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Il {date}, {from} ha scritto:",
+    "forwarded_separator": "---------- Messaggio inoltrato ----------",
+    "from_label": "Da",
+    "date_label": "Data",
+    "subject_label": "Oggetto"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "Email",

locales/ja/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date}に{from}が書きました:",
+    "forwarded_separator": "---------- 転送メッセージ ----------",
+    "from_label": "差出人",
+    "date_label": "日付",
+    "subject_label": "件名"
+  },
   "login": {
     "title": "ウェブメール",
     "username_label": "メールアドレス",

locales/ko/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date}에 {from}님이 작성:",
+    "forwarded_separator": "---------- 전달된 메시지 ----------",
+    "from_label": "보낸 사람",
+    "date_label": "날짜",
+    "subject_label": "제목"
+  },
   "login": {
     "title": "웹메일",
     "username_label": "이메일",

locales/lv/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date} {from} rakstīja:",
+    "forwarded_separator": "---------- Pārsūtītā ziņa ----------",
+    "from_label": "No",
+    "date_label": "Datums",
+    "subject_label": "Tēma"
+  },
   "login": {
     "title": "Tīmekļa pasts",
     "username_label": "E-pasta adrese",

locales/nl/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Op {date} schreef {from}:",
+    "forwarded_separator": "---------- Doorgestuurd bericht ----------",
+    "from_label": "Van",
+    "date_label": "Datum",
+    "subject_label": "Onderwerp"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "E-mail",

locales/pl/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date}, {from} napisał(a):",
+    "forwarded_separator": "---------- Wiadomość przekazana ----------",
+    "from_label": "Od",
+    "date_label": "Data",
+    "subject_label": "Temat"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "E-mail",

locales/pt/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "Em {date}, {from} escreveu:",
+    "forwarded_separator": "---------- Mensagem encaminhada ----------",
+    "from_label": "De",
+    "date_label": "Data",
+    "subject_label": "Assunto"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "E-mail",

locales/ru/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date}, {from} написал:",
+    "forwarded_separator": "---------- Пересланное сообщение ----------",
+    "from_label": "От",
+    "date_label": "Дата",
+    "subject_label": "Тема"
+  },
   "login": {
     "title": "Веб-почта",
     "username_label": "Электронная почта",

locales/tr/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date} tarihinde {from} şunu yazdı:",
+    "forwarded_separator": "---------- İletilen mesaj ----------",
+    "from_label": "Kimden",
+    "date_label": "Tarih",
+    "subject_label": "Konu"
+  },
   "login": {
     "title": "Webmail",
     "username_label": "E-posta",

locales/uk/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "{date}, {from} написав:",
+    "forwarded_separator": "---------- Переслане повідомлення ----------",
+    "from_label": "Від",
+    "date_label": "Дата",
+    "subject_label": "Тема"
+  },
   "login": {
     "title": "Веб-пошта",
     "username_label": "Електронна пошта",

locales/zh/common.json

@@ -1,4 +1,11 @@
 {
+  "quote_header": {
+    "reply_line": "在 {date}，{from} 写道：",
+    "forwarded_separator": "---------- 转发邮件 ----------",
+    "from_label": "发件人",
+    "date_label": "日期",
+    "subject_label": "主题"
+  },
   "login": {
     "title": "网页邮箱",
     "username_label": "邮箱地址",