diff --git a/apps/web/src/composer.tsx b/apps/web/src/composer.tsx
index 15775e3..191bafd 100644
--- a/apps/web/src/composer.tsx
+++ b/apps/web/src/composer.tsx
@@ -78,18 +78,19 @@ function EditorReferencePlugin({ onReady }: { onReady: (editor: LexicalEditor) =
   return null;
 }
 
-function FormatToolbar({ editor }: { editor: LexicalEditor | null }) {
+function FormatToolbar({ editor, locale }: { editor: LexicalEditor | null; locale: Locale }) {
+  const t = (key: Parameters<typeof translate>[1]) => translate(locale, key);
   const format = (kind: "bold" | "italic" | "underline") =>
     editor?.dispatchCommand(FORMAT_TEXT_COMMAND, kind);
   return (
-    <div className="compose-format" aria-label="Formatting" role="toolbar">
-      <Button size="icon" aria-label="Bold" onClick={() => format("bold")}>
+    <div className="compose-format" aria-label={t("formatting")} role="toolbar">
+      <Button size="icon" aria-label={t("bold")} onClick={() => format("bold")}>
         <Bold size={15} />
       </Button>
-      <Button size="icon" aria-label="Italic" onClick={() => format("italic")}>
+      <Button size="icon" aria-label={t("italic")} onClick={() => format("italic")}>
         <Italic size={15} />
       </Button>
-      <Button size="icon" aria-label="Underline" onClick={() => format("underline")}>
+      <Button size="icon" aria-label={t("underline")} onClick={() => format("underline")}>
         <Underline size={15} />
       </Button>
     </div>
@@ -534,7 +535,7 @@ export function ComposePanel({
               >
                 <Send size={16} /> {t("send")}
               </Button>
-              <FormatToolbar editor={editor} />
+              <FormatToolbar editor={editor} locale={locale} />
               <input
                 ref={fileInput}
                 className="compose-file-input"
diff --git a/apps/web/src/i18n.test.ts b/apps/web/src/i18n.test.ts
index c211d99..46dd5d2 100644
--- a/apps/web/src/i18n.test.ts
+++ b/apps/web/src/i18n.test.ts
@@ -14,6 +14,10 @@ describe("translations", () => {
     resetTranslationCatalogForTests();
     expect(translate("en", "inbox")).toBe("Inbox");
     expect(translate("es", "inbox")).toBe("Recibidos");
+    expect(translate("es", "accountMenu")).toBe("Menú de cuenta");
+    expect(translate("es", "moreActions")).toBe("Más acciones");
+    expect(translate("es", "trash")).toBe("Papelera");
+    expect(translate("es", "formatting")).toBe("Formato");
     expect(Object.keys(builtinTranslations.es).sort()).toEqual(
       Object.keys(builtinTranslations.en).sort(),
     );
diff --git a/apps/web/src/pages.tsx b/apps/web/src/pages.tsx
index 08c687c..44e6a30 100644
--- a/apps/web/src/pages.tsx
+++ b/apps/web/src/pages.tsx
@@ -189,7 +189,7 @@ function Header({
   return (
     <header className="topbar">
       <div className="topbar-start">
-        <Button size="icon" aria-label="Toggle navigation" onClick={onMenu}>
+        <Button size="icon" aria-label={t("toggleNavigation")} onClick={onMenu}>
           <Menu size={19} />
         </Button>
         <Brand />
@@ -265,7 +265,7 @@ function Header({
         >
           <Settings size={18} />
         </Button>
-        <Button size="icon" aria-label="Notifications">
+        <Button size="icon" aria-label={t("notifications")}>
           <Bell size={18} />
         </Button>
         <div className="locale-menu-anchor" ref={localeMenu}>
@@ -311,7 +311,7 @@ function Header({
           <button
             className="avatar"
             type="button"
-            aria-label="Account menu"
+            aria-label={t("accountMenu")}
             aria-haspopup="menu"
             aria-expanded={showAccounts}
             onClick={() => {
@@ -410,12 +410,14 @@ function LabelBranch({
   collapsed,
   onToggle,
   onSelect,
+  t,
 }: {
   node: LabelTreeNode;
   depth: number;
   collapsed: Set<string>;
   onToggle: (path: string) => void;
   onSelect: (label: MailLabel) => void;
+  t: Translator;
 }) {
   const hasChildren = node.children.length > 0;
   const isCollapsed = collapsed.has(node.path);
@@ -426,7 +428,7 @@ function LabelBranch({
           <button
             className="label-disclosure"
             type="button"
-            aria-label={`${isCollapsed ? "Expand" : "Collapse"} ${node.name}`}
+            aria-label={`${t(isCollapsed ? "expandLabel" : "collapseLabel")} ${node.name}`}
             aria-expanded={!isCollapsed}
             onClick={() => onToggle(node.path)}
           >
@@ -456,6 +458,7 @@ function LabelBranch({
               collapsed={collapsed}
               onToggle={onToggle}
               onSelect={onSelect}
+              t={t}
             />
           ))}
         </div>
@@ -514,12 +517,12 @@ function Sidebar({
         <Pencil size={18} />
         <span>{t("compose")}</span>
       </Button>
-      <nav aria-label="Mailboxes" className="nav-list">
+      <nav aria-label={t("mailboxes")} className="nav-list">
         {mailboxItems.map(([key, Icon], index) => {
           const role = key === "allMail" ? "all" : key;
           const mailbox = mailboxByRole.get(role as Mailbox["role"]);
           const count = mailbox?.unreadCount ?? 0;
-          const label = mailbox?.localName || mailbox?.remoteName || t(key);
+          const label = t(key);
           return (
             <button
               aria-label={label}
@@ -549,16 +552,18 @@ function Sidebar({
           <div id="secondary-mailboxes" className="secondary-mailboxes">
             {extraMailboxes.map((mailbox) => {
               const Icon = extraIcons[mailbox.role as keyof typeof extraIcons];
+              const labelKey = mailbox.role === "junk" ? "spam" : mailbox.role;
+              const label = t(labelKey as TranslationKey);
               return (
                 <button
-                  aria-label={mailbox.localName || mailbox.remoteName}
+                  aria-label={label}
                   className="nav-item"
                   type="button"
                   key={mailbox.id}
                   onClick={() => onMailboxSelect(mailbox)}
                 >
                   <Icon size={17} />
-                  <span>{mailbox.localName || mailbox.remoteName}</span>
+                  <span>{label}</span>
                   {mailbox.unreadCount > 0 && <strong>{mailbox.unreadCount}</strong>}
                 </button>
               );
@@ -586,6 +591,7 @@ function Sidebar({
               })
             }
             onSelect={onLabelSelect}
+            t={t}
           />
         ))}
       </nav>
@@ -667,7 +673,7 @@ function MailToolbar({
             )}
           </>
         )}
-        <Button size="icon" aria-label="More actions">
+        <Button size="icon" aria-label={t("moreActions")}>
           <MoreHorizontal size={18} />
         </Button>
       </div>
@@ -735,6 +741,7 @@ function MessageRow({
   onTrash,
   onReadToggle,
   onImportant,
+  locale,
   t,
   actionsEnabled,
 }: {
@@ -748,6 +755,7 @@ function MessageRow({
   onTrash: () => void;
   onReadToggle: () => void;
   onImportant: () => void;
+  locale: Locale;
   t: Translator;
   actionsEnabled: boolean;
 }) {
@@ -835,7 +843,7 @@ function MessageRow({
           {message.messageCount}
         </span>
         <time dateTime={message.lastMessageAt}>
-          {new Intl.DateTimeFormat(undefined, { month: "short", day: "numeric" }).format(
+          {new Intl.DateTimeFormat(locale, { month: "short", day: "numeric" }).format(
             new Date(message.lastMessageAt),
           )}
         </time>
@@ -961,6 +969,7 @@ function VirtualMessageList({
   onStar,
   onOpen,
   onAction,
+  locale,
   t,
   actionsEnabled,
 }: {
@@ -970,6 +979,7 @@ function VirtualMessageList({
   onStar: (id: string, starred: boolean) => void;
   onOpen: (id: string) => void;
   onAction: (kind: MailActionKind, ids: string[]) => void;
+  locale: Locale;
   t: Translator;
   actionsEnabled: boolean;
 }) {
@@ -1012,6 +1022,7 @@ function VirtualMessageList({
                     message.id,
                   ])
                 }
+                locale={locale}
                 t={t}
                 actionsEnabled={actionsEnabled}
               />
@@ -1679,6 +1690,7 @@ export function MailPage({ initialLocale = "en" }: { initialLocale?: Locale }) {
                   onSelect={toggleSelection}
                   onOpen={setActiveThreadId}
                   onAction={(kind, ids) => void runAction(kind, ids)}
+                  locale={locale}
                   t={t}
                   onStar={(id, isStarred) => void runAction(isStarred ? "unstar" : "star", [id])}
                   actionsEnabled={canActions}
diff --git a/apps/web/tests/inbox.spec.ts b/apps/web/tests/inbox.spec.ts
index fd77506..a5a8f9a 100644
--- a/apps/web/tests/inbox.spec.ts
+++ b/apps/web/tests/inbox.spec.ts
@@ -330,6 +330,14 @@ test("live inbox virtualizes large account-scoped pages and preserves selection"
   await expect(page.getByText("Sender 0", { exact: true })).toBeVisible({ timeout: 20_000 });
   await expect.poll(() => Boolean(eventSocket)).toBe(true);
   expect(await page.locator(".message-row").count()).toBeLessThan(100);
+  const visualRegressionProjects = new Set(["desktop-large", "tablet-portrait", "mobile"]);
+  if (visualRegressionProjects.has(testInfo.project.name)) {
+    await expect(page).toHaveScreenshot(`inbox-${testInfo.project.name}-en.png`, {
+      animations: "disabled",
+      caret: "hide",
+      maxDiffPixelRatio: 0.05,
+    });
+  }
 
   await page.getByRole("button", { name: "Account menu" }).click();
   await expect(page.getByRole("menu", { name: "Accounts" })).toContainText("Personal");
@@ -343,6 +351,34 @@ test("live inbox virtualizes large account-scoped pages and preserves selection"
   );
   await page.getByRole("menuitemradio", { name: "ES Spanish" }).click();
   await expect(page.getByRole("button", { name: "ES", exact: true })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Alternar navegación" })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Notificaciones" })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Menú de cuenta" })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Más acciones" })).toBeVisible();
+  await expect(page.locator("time").first()).toContainText("sept");
+  if (visualRegressionProjects.has(testInfo.project.name)) {
+    await expect(page).toHaveScreenshot(`inbox-${testInfo.project.name}-es.png`, {
+      animations: "disabled",
+      caret: "hide",
+      maxDiffPixelRatio: 0.05,
+    });
+  }
+  if ((page.viewportSize()?.width ?? 0) >= 1200) {
+    await expect(page.getByRole("navigation", { name: "Buzones" })).toBeVisible();
+    await expect(page.getByRole("button", { name: "Recibidos", exact: true })).toBeVisible();
+    await expect(page.getByRole("button", { name: "Developer" })).toBeHidden();
+    await page.getByRole("button", { name: "Expandir Buzones" }).click();
+    await expect(page.getByRole("button", { name: "Developer" })).toBeVisible();
+    await page.getByRole("button", { name: "Contraer Buzones" }).click();
+    await page.getByRole("button", { name: "Más", exact: true }).click();
+    await expect(page.getByRole("button", { name: "Papelera", exact: true })).toBeVisible();
+    await expect(page.getByRole("button", { name: "Spam", exact: true })).toBeVisible();
+    await page.getByRole("button", { name: "Más", exact: true }).click();
+  }
+  await page.locator(".message-row").first().click({ button: "right" });
+  await expect(page.getByRole("menu", { name: /Acciones para Sender 0/ })).toBeVisible();
+  await expect(page.getByRole("menuitem", { name: "Abrir", exact: true })).toBeVisible();
+  await page.keyboard.press("Escape");
   await page.getByRole("button", { name: "ES", exact: true }).click();
   await page.getByRole("menuitemradio", { name: "EN Inglés" }).click();
 
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-en-desktop-large-darwin.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-en-desktop-large-darwin.png
new file mode 100644
index 0000000..c7870c3
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-en-desktop-large-darwin.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-en-desktop-large-linux.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-en-desktop-large-linux.png
new file mode 100644
index 0000000..776c191
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-en-desktop-large-linux.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-es-desktop-large-darwin.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-es-desktop-large-darwin.png
new file mode 100644
index 0000000..f0dcc4a
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-es-desktop-large-darwin.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-es-desktop-large-linux.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-es-desktop-large-linux.png
new file mode 100644
index 0000000..a82da85
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-desktop-large-es-desktop-large-linux.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-en-mobile-darwin.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-en-mobile-darwin.png
new file mode 100644
index 0000000..a7a60c6
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-en-mobile-darwin.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-en-mobile-linux.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-en-mobile-linux.png
new file mode 100644
index 0000000..cc782cc
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-en-mobile-linux.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-es-mobile-darwin.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-es-mobile-darwin.png
new file mode 100644
index 0000000..c91ed5c
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-es-mobile-darwin.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-es-mobile-linux.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-es-mobile-linux.png
new file mode 100644
index 0000000..7aef0e2
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-mobile-es-mobile-linux.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-en-tablet-portrait-darwin.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-en-tablet-portrait-darwin.png
new file mode 100644
index 0000000..50c08d1
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-en-tablet-portrait-darwin.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-en-tablet-portrait-linux.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-en-tablet-portrait-linux.png
new file mode 100644
index 0000000..0de1b1e
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-en-tablet-portrait-linux.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-es-tablet-portrait-darwin.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-es-tablet-portrait-darwin.png
new file mode 100644
index 0000000..32b6ab8
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-es-tablet-portrait-darwin.png differ
diff --git a/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-es-tablet-portrait-linux.png b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-es-tablet-portrait-linux.png
new file mode 100644
index 0000000..06fef91
Binary files /dev/null and b/apps/web/tests/inbox.spec.ts-snapshots/inbox-tablet-portrait-es-tablet-portrait-linux.png differ
diff --git a/services/api/internal/modules/translations/catalogs.json b/services/api/internal/modules/translations/catalogs.json
index ae73c6f..e7719cd 100644
--- a/services/api/internal/modules/translations/catalogs.json
+++ b/services/api/internal/modules/translations/catalogs.json
@@ -8,11 +8,20 @@
     "allMail": "All mail",
     "drafts": "Drafts",
     "sent": "Sent",
+    "spam": "Spam",
+    "trash": "Trash",
     "more": "More",
+    "moreActions": "More actions",
+    "mailboxes": "Mailboxes",
+    "toggleNavigation": "Toggle navigation",
+    "notifications": "Notifications",
+    "accountMenu": "Account menu",
     "language": "Language",
     "languageEnglish": "English",
     "languageSpanish": "Spanish",
     "labels": "Labels",
+    "expandLabel": "Expand",
+    "collapseLabel": "Collapse",
     "accounts": "Accounts",
     "compose": "Compose",
     "search": "Search mail",
@@ -99,6 +108,10 @@
     "maximize": "Maximize",
     "close": "Close",
     "discardDraft": "Discard draft",
+    "formatting": "Formatting",
+    "bold": "Bold",
+    "italic": "Italic",
+    "underline": "Underline",
     "draft.editing": "Editing",
     "draft.saving": "Saving…",
     "draft.saved": "Saved",
@@ -364,11 +377,20 @@
     "allMail": "Todos",
     "drafts": "Borradores",
     "sent": "Enviados",
+    "spam": "Spam",
+    "trash": "Papelera",
     "more": "Más",
+    "moreActions": "Más acciones",
+    "mailboxes": "Buzones",
+    "toggleNavigation": "Alternar navegación",
+    "notifications": "Notificaciones",
+    "accountMenu": "Menú de cuenta",
     "language": "Idioma",
     "languageEnglish": "Inglés",
     "languageSpanish": "Español",
     "labels": "Etiquetas",
+    "expandLabel": "Expandir",
+    "collapseLabel": "Contraer",
     "accounts": "Cuentas",
     "compose": "Redactar",
     "search": "Buscar correo",
@@ -455,6 +477,10 @@
     "maximize": "Maximizar",
     "close": "Cerrar",
     "discardDraft": "Descartar borrador",
+    "formatting": "Formato",
+    "bold": "Negrita",
+    "italic": "Cursiva",
+    "underline": "Subrayado",
     "draft.editing": "Editando",
     "draft.saving": "Guardando…",
     "draft.saved": "Guardado",