diff --git a/messages/en.json b/messages/en.json
index 0987a94..b45f3f3 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -13,5 +13,51 @@
     "signIn": "Sign in",
     "noAccount": "Don't have an account?",
     "createAccount": "Create account"
+  },
+  "Sidebar": {
+    "title": "CRM Template for WhatsApp",
+    "dashboard": "Dashboard",
+    "inbox": "Inbox",
+    "notifications": "Notifications",
+    "contacts": "Contacts",
+    "pipelines": "Pipelines",
+    "broadcasts": "Broadcasts",
+    "automations": "Automations",
+    "flows": "Flows",
+    "aiAgents": "AI Agents",
+    "settings": "Settings",
+    "beta": "Beta",
+    "unreadConversations": "{count} unread {count, plural, =1 {conversation} other {conversations}}",
+    "unreadNotifications": "{count} unread {count, plural, =1 {notification} other {notifications}}",
+    "roleOwner": "Owner",
+    "roleAdmin": "Admin",
+    "roleAgent": "Agent",
+    "roleViewer": "Viewer",
+    "closeMenu": "Close menu",
+    "defaultUser": "User",
+    "defaultAvatar": "Avatar",
+    "menuProfile": "Profile",
+    "menuSettings": "Settings",
+    "menuSignOut": "Sign out"
+  },
+  "Header": {
+    "dashboard": "Dashboard",
+    "inbox": "Inbox",
+    "notifications": "Notifications",
+    "contacts": "Contacts",
+    "pipelines": "Pipelines",
+    "broadcasts": "Broadcasts",
+    "automations": "Automations",
+    "settings": "Settings",
+    "openMenu": "Open menu",
+    "openAccountMenu": "Open account menu",
+    "defaultUser": "User",
+    "defaultAvatar": "Avatar",
+    "menuProfile": "Profile",
+    "menuSettings": "Settings",
+    "menuSignOut": "Sign out"
+  },
+  "ModeToggle": {
+    "switchMode": "Switch to {mode} mode"
   }
 }
diff --git a/src/components/layout/header.tsx b/src/components/layout/header.tsx
index 45d615b..2746593 100644
--- a/src/components/layout/header.tsx
+++ b/src/components/layout/header.tsx
@@ -19,22 +19,22 @@ import {
 import { ModeToggle } from "@/components/layout/mode-toggle";
 
 const pageTitles: Record<string, string> = {
-  "/dashboard": "Dashboard",
-  "/inbox": "Inbox",
-  "/notifications": "Notifications",
-  "/contacts": "Contacts",
-  "/pipelines": "Pipelines",
-  "/broadcasts": "Broadcasts",
-  "/automations": "Automations",
-  "/settings": "Settings",
+  "/dashboard": "dashboard",
+  "/inbox": "inbox",
+  "/notifications": "notifications",
+  "/contacts": "contacts",
+  "/pipelines": "pipelines",
+  "/broadcasts": "broadcasts",
+  "/automations": "automations",
+  "/settings": "settings",
 };
 
-function getPageTitle(pathname: string): string {
+function getPageTitleKey(pathname: string): string {
   if (pageTitles[pathname]) return pageTitles[pathname];
   const match = Object.entries(pageTitles).find(([path]) =>
     pathname.startsWith(path),
   );
-  return match ? match[1] : "Dashboard";
+  return match ? match[1] : "dashboard";
 }
 
 interface HeaderProps {
@@ -43,10 +43,13 @@ interface HeaderProps {
   onOpenSidebar?: () => void;
 }
 
+import { useTranslations } from "next-intl";
+
 export function Header({ onOpenSidebar }: HeaderProps) {
+  const t = useTranslations("Header");
   const pathname = usePathname();
   const { profile, signOut } = useAuth();
-  const title = getPageTitle(pathname);
+  const titleKey = getPageTitleKey(pathname);
 
   const initial =
     profile?.full_name?.charAt(0)?.toUpperCase() ??
@@ -60,13 +63,13 @@ export function Header({ onOpenSidebar }: HeaderProps) {
         <button
           type="button"
           onClick={onOpenSidebar}
-          aria-label="Open menu"
+          aria-label={t("openMenu")}
           className="flex h-10 w-10 items-center justify-center rounded-md text-muted-foreground transition-colors hover:bg-muted hover:text-foreground lg:hidden"
         >
           <Menu className="h-5 w-5" />
         </button>
         <h1 className="truncate text-base font-semibold text-foreground sm:text-lg">
-          {title}
+          {t(titleKey as any)}
         </h1>
       </div>
 
@@ -76,13 +79,13 @@ export function Header({ onOpenSidebar }: HeaderProps) {
         <DropdownMenu>
         <DropdownMenuTrigger
           className="flex items-center gap-2 rounded-md px-1 py-1 transition-colors hover:bg-muted/70 focus:bg-muted/70 focus:outline-none data-popup-open:bg-muted/70 sm:gap-3 sm:pl-1 sm:pr-3"
-          aria-label="Open account menu"
+          aria-label={t("openAccountMenu")}
         >
           <Avatar className="size-8">
             {profile?.avatar_url ? (
               <AvatarImage
                 src={profile.avatar_url}
-                alt={profile.full_name ?? "Avatar"}
+                alt={profile.full_name ?? t("defaultAvatar")}
               />
             ) : null}
             <AvatarFallback className="bg-primary/10 text-sm font-medium text-primary">
@@ -90,7 +93,7 @@ export function Header({ onOpenSidebar }: HeaderProps) {
             </AvatarFallback>
           </Avatar>
           <span className="hidden text-sm font-medium text-foreground sm:inline">
-            {profile?.full_name ?? "User"}
+            {profile?.full_name ?? t("defaultUser")}
           </span>
         </DropdownMenuTrigger>
         <DropdownMenuContent
@@ -100,7 +103,7 @@ export function Header({ onOpenSidebar }: HeaderProps) {
         >
           <div className="px-2 py-1.5">
             <p className="truncate text-sm font-medium text-foreground">
-              {profile?.full_name ?? "User"}
+              {profile?.full_name ?? t("defaultUser")}
             </p>
             <p className="truncate text-xs text-muted-foreground">
               {profile?.email ?? ""}
@@ -116,7 +119,7 @@ export function Header({ onOpenSidebar }: HeaderProps) {
             }
           >
             <User className="size-4" />
-            Profile
+            {t("menuProfile")}
           </DropdownMenuItem>
           <DropdownMenuItem
             render={
@@ -127,7 +130,7 @@ export function Header({ onOpenSidebar }: HeaderProps) {
             }
           >
             <SettingsIcon className="size-4" />
-            Settings
+            {t("menuSettings")}
           </DropdownMenuItem>
           <DropdownMenuSeparator className="bg-border" />
           <DropdownMenuItem
@@ -135,7 +138,7 @@ export function Header({ onOpenSidebar }: HeaderProps) {
             className="text-popover-foreground focus:bg-accent focus:text-accent-foreground"
           >
             <LogOut className="size-4" />
-            Sign out
+            {t("menuSignOut")}
           </DropdownMenuItem>
         </DropdownMenuContent>
         </DropdownMenu>
diff --git a/src/components/layout/mode-toggle.tsx b/src/components/layout/mode-toggle.tsx
index 273dc10..acf7bfc 100644
--- a/src/components/layout/mode-toggle.tsx
+++ b/src/components/layout/mode-toggle.tsx
@@ -5,6 +5,8 @@ import { Moon, Sun } from "lucide-react";
 import { useTheme } from "@/hooks/use-theme";
 import { cn } from "@/lib/utils";
 
+import { useTranslations } from "next-intl";
+
 /**
  * Light/dark mode toggle — a single icon button that flips the app
  * between the two modes. Sun shows in light mode (click → go dark),
@@ -14,14 +16,17 @@ import { cn } from "@/lib/utils";
  * 40×40 hit target to match the header's other touch controls.
  */
 export function ModeToggle({ className }: { className?: string }) {
+  const t = useTranslations("ModeToggle");
   const { mode, toggleMode } = useTheme();
   const goingTo = mode === "dark" ? "light" : "dark";
+  const switchLabel = t("switchMode", { mode: goingTo });
+  
   return (
     <button
       type="button"
       onClick={toggleMode}
-      aria-label={`Switch to ${goingTo} mode`}
-      title={`Switch to ${goingTo} mode`}
+      aria-label={switchLabel}
+      title={switchLabel}
       className={cn(
         "flex h-10 w-10 items-center justify-center rounded-md text-muted-foreground transition-colors hover:bg-muted hover:text-foreground",
         className,
diff --git a/src/components/layout/sidebar.tsx b/src/components/layout/sidebar.tsx
index bce6329..a3d6d58 100644
--- a/src/components/layout/sidebar.tsx
+++ b/src/components/layout/sidebar.tsx
@@ -34,32 +34,32 @@ import type { AccountRole } from "@/lib/auth/roles";
 // wants to recolour "agent" rows, this is the one diff.
 const ROLE_CHIP: Record<
   AccountRole,
-  { icon: typeof Crown; label: string; className: string }
+  { icon: typeof Crown; labelKey: string; className: string }
 > = {
   owner: {
     icon: Crown,
-    label: "Owner",
+    labelKey: "roleOwner",
     // Amber: scarce, immutable, "the boss" — gets visual emphasis.
     className:
       "border-amber-500/40 bg-amber-500/10 text-amber-300",
   },
   admin: {
     icon: Shield,
-    label: "Admin",
+    labelKey: "roleAdmin",
     // Primary-tinted: significant but not as scarce as owner.
     className:
       "border-primary/40 bg-primary/10 text-primary",
   },
   agent: {
     icon: UserCog,
-    label: "Agent",
+    labelKey: "roleAgent",
     // Neutral slate: the operational default.
     className:
       "border-border bg-muted text-foreground",
   },
   viewer: {
     icon: User,
-    label: "Viewer",
+    labelKey: "roleViewer",
     // Muted slate: read-only role; visually quieter than agent.
     className:
       "border-border bg-card text-muted-foreground",
@@ -80,7 +80,7 @@ import {
 
 interface NavItem {
   href: string;
-  label: string;
+  labelKey: string;
   icon: typeof LayoutDashboard;
   /**
    * When true, the nav row renders a small "Beta" chip after the label.
@@ -90,19 +90,19 @@ interface NavItem {
 }
 
 const navItems: NavItem[] = [
-  { href: "/dashboard", label: "Dashboard", icon: LayoutDashboard },
-  { href: "/inbox", label: "Inbox", icon: MessageSquare },
-  { href: "/notifications", label: "Notifications", icon: Bell },
-  { href: "/contacts", label: "Contacts", icon: Users },
-  { href: "/pipelines", label: "Pipelines", icon: GitBranch },
-  { href: "/broadcasts", label: "Broadcasts", icon: Radio },
-  { href: "/automations", label: "Automations", icon: Zap },
-  { href: "/flows", label: "Flows", icon: Workflow, beta: true },
-  { href: "/agents", label: "AI Agents", icon: Bot },
+  { href: "/dashboard", labelKey: "dashboard", icon: LayoutDashboard },
+  { href: "/inbox", labelKey: "inbox", icon: MessageSquare },
+  { href: "/notifications", labelKey: "notifications", icon: Bell },
+  { href: "/contacts", labelKey: "contacts", icon: Users },
+  { href: "/pipelines", labelKey: "pipelines", icon: GitBranch },
+  { href: "/broadcasts", labelKey: "broadcasts", icon: Radio },
+  { href: "/automations", labelKey: "automations", icon: Zap },
+  { href: "/flows", labelKey: "flows", icon: Workflow, beta: true },
+  { href: "/agents", labelKey: "aiAgents", icon: Bot },
 ];
 
 const bottomNavItems = [
-  { href: "/settings", label: "Settings", icon: Settings },
+  { href: "/settings", labelKey: "settings", icon: Settings },
 ];
 
 interface SidebarProps {
@@ -111,7 +111,10 @@ interface SidebarProps {
   onClose?: () => void;
 }
 
+import { useTranslations } from "next-intl";
+
 export function Sidebar({ open = false, onClose }: SidebarProps) {
+  const t = useTranslations("Sidebar");
   const pathname = usePathname();
   const { profile, profileLoading, account, accountRole, signOut } = useAuth();
   const totalUnread = useTotalUnread();
@@ -160,7 +163,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
           part of the main flex row there. */}
       <button
         type="button"
-        aria-label="Close menu"
+        aria-label={t("closeMenu")}
         onClick={onClose}
         className={cn(
           "fixed inset-0 z-30 bg-background/70 backdrop-blur-sm transition-opacity lg:hidden",
@@ -189,13 +192,13 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
               <MessageSquare className="h-4 w-4" />
             </div>
             <span className="text-sm font-semibold text-foreground">
-              CRM Template for WhatsApp
+              {t("title")}
             </span>
           </Link>
           <button
             type="button"
             onClick={onClose}
-            aria-label="Close menu"
+            aria-label={t("closeMenu")}
             className="flex h-9 w-9 items-center justify-center rounded-md text-muted-foreground hover:bg-muted hover:text-foreground lg:hidden"
           >
             <X className="h-5 w-5" />
@@ -233,18 +236,18 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                     )}
                   >
                     <item.icon className="h-4 w-4" />
-                    <span className="flex-1">{item.label}</span>
+                    <span className="flex-1">{t(item.labelKey as any)}</span>
                     {item.beta && (
                       <span
-                        aria-label="Beta feature"
+                        aria-label={t("beta")}
                         className="rounded-full border border-amber-500/40 bg-amber-500/10 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wider text-amber-300"
                       >
-                        Beta
+                        {t("beta")}
                       </span>
                     )}
                     {showUnreadDot && (
                       <span
-                        aria-label={`${totalUnread} unread conversation${totalUnread === 1 ? "" : "s"}`}
+                        aria-label={t("unreadConversations", { count: totalUnread })}
                         className="relative flex h-2 w-2"
                       >
                         <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-primary opacity-75" />
@@ -253,7 +256,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                     )}
                     {showNotificationBadge && (
                       <span
-                        aria-label={`${unreadNotifications} unread notification${unreadNotifications === 1 ? "" : "s"}`}
+                        aria-label={t("unreadNotifications", { count: unreadNotifications })}
                         className="flex h-5 min-w-5 items-center justify-center rounded-full bg-primary px-1 text-[10px] font-semibold text-primary-foreground"
                       >
                         {unreadNotifications > 9 ? "9+" : unreadNotifications}
@@ -282,7 +285,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                     )}
                   >
                     <item.icon className="h-4 w-4" />
-                    {item.label}
+                    {t(item.labelKey as any)}
                   </Link>
                 </li>
               );
@@ -320,7 +323,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                       className={`ml-auto inline-flex shrink-0 items-center gap-1 rounded-full border px-1.5 py-0.5 text-[10px] font-medium uppercase tracking-wider ${meta.className}`}
                     >
                       <Icon className="size-3" />
-                      {meta.label}
+                      {t(meta.labelKey as any)}
                     </span>
                   );
                 })()
@@ -333,7 +336,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                 {profile?.avatar_url ? (
                   <AvatarImage
                     src={profile.avatar_url}
-                    alt={profile.full_name ?? "Avatar"}
+                    alt={profile.full_name ?? t("defaultAvatar")}
                   />
                 ) : null}
                 <AvatarFallback className="bg-primary/10 text-sm font-medium text-primary">
@@ -344,7 +347,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
               </Avatar>
               <div className="min-w-0 flex-1">
                 <p className="truncate text-sm font-medium text-foreground">
-                  {profile?.full_name ?? "User"}
+                  {profile?.full_name ?? t("defaultUser")}
                 </p>
                 <p className="truncate text-xs text-muted-foreground">
                   {profile?.email ?? ""}
@@ -367,7 +370,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                 }
               >
                 <User className="size-4" />
-                Profile
+                {t("menuProfile")}
               </DropdownMenuItem>
               <DropdownMenuItem
                 render={
@@ -379,7 +382,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                 }
               >
                 <Settings className="size-4" />
-                Settings
+                {t("menuSettings")}
               </DropdownMenuItem>
               <DropdownMenuSeparator className="bg-border" />
               <DropdownMenuItem
@@ -387,7 +390,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                 className="text-popover-foreground focus:bg-accent focus:text-accent-foreground"
               >
                 <LogOut className="size-4" />
-                Sign out
+                {t("menuSignOut")}
               </DropdownMenuItem>
             </DropdownMenuContent>
           </DropdownMenu>