diff --git a/backend/main.py b/backend/main.py
index 6ced7a8..a7740a2 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -80,8 +80,9 @@ if 'AUTHENTICATION_SECRET_KEY' in os.environ:
 # Initialize app
 app = FastAPI(
     title=config['app']['name'],
-    description=config['app']['tagline'],
-    version=config['app']['version']
+    version=config['app']['version'],
+    docs_url=None,    # Disable Swagger UI at /docs
+    redoc_url=None    # Disable ReDoc at /redoc
 )
 
 # CORS middleware configuration
@@ -325,8 +326,7 @@ async def api_documentation():
     return {
         "app": {
             "name": config['app']['name'],
-            "version": config['app']['version'],
-            "description": config['app']['tagline']
+            "version": config['app']['version']
         },
         "endpoints": [
             {
@@ -339,7 +339,7 @@ async def api_documentation():
                 "method": "GET",
                 "path": "/api/config",
                 "description": "Get application configuration",
-                "response": "{ name, tagline, version, searchEnabled }"
+                "response": "{ name, version, searchEnabled }"
             },
             {
                 "method": "GET",
@@ -489,7 +489,6 @@ async def get_config():
     """Get app configuration for frontend"""
     return {
         "name": config['app']['name'],
-        "tagline": config['app']['tagline'],
         "version": config['app']['version'],
         "searchEnabled": config['search']['enabled'],
         "demoMode": DEMO_MODE,  # Expose demo mode flag to frontend
diff --git a/config.yaml b/config.yaml
index 5e88d3e..d83c30b 100644
--- a/config.yaml
+++ b/config.yaml
@@ -3,7 +3,7 @@
 
 app:
   name: "NoteDiscovery"
-  tagline: "Your Self-Hosted Knowledge Base"
+  # Tagline is now localized - see locales/*.json files (app.tagline key)
   
 server:
   host: "0.0.0.0"
@@ -28,7 +28,7 @@ search:
 authentication:
   # Authentication settings
   # Set enabled to true to require login
-  enabled: false
+  enabled: true
   
   # ⚠️ SECURITY WARNING: Change these values before exposing to the internet!
   # Default values below are for LOCAL TESTING ONLY
diff --git a/frontend/app.js b/frontend/app.js
index 046fd52..facaa34 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -36,7 +36,6 @@ function noteApp() {
     return {
         // App state
         appName: 'NoteDiscovery',
-        appTagline: 'Your Self-Hosted Knowledge Base',
         appVersion: '0.0.0',
         authEnabled: false,
         notes: [],
@@ -568,7 +567,6 @@ function noteApp() {
                 const response = await fetch('/api/config');
                 const config = await response.json();
                 this.appName = config.name;
-                this.appTagline = config.tagline;
                 this.appVersion = config.version || '0.0.0';
                 this.authEnabled = config.authentication?.enabled || false;
             } catch (error) {
@@ -1441,7 +1439,7 @@ function noteApp() {
                             </button>
                             <span class="flex items-center gap-1 flex-1" style="overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 500; pointer-events: none;">
                                 <span>${folder.name}</span>
-                                ${folder.notes.length === 0 && (!folder.children || Object.keys(folder.children).length === 0) ? '<span class="text-xs" style="color: var(--text-tertiary); font-weight: 400;">(empty)</span>' : ''}
+                                ${folder.notes.length === 0 && (!folder.children || Object.keys(folder.children).length === 0) ? `<span class="text-xs" style="color: var(--text-tertiary); font-weight: 400;">(${this.t('folders.empty')})</span>` : ''}
                             </span>
                         </div>
                         <div class="hover-buttons flex gap-1 transition-opacity absolute right-2 top-1/2 transform -translate-y-1/2" style="opacity: 0; pointer-events: none; background: linear-gradient(to right, transparent, var(--bg-hover) 20%, var(--bg-hover)); padding-left: 20px;" onclick="event.stopPropagation()">
diff --git a/frontend/index.html b/frontend/index.html
index 545dcfc..e8e322c 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1394,7 +1394,8 @@
                         <!-- Empty state -->
                         <template x-if="notes.length === 0 && allFolders.length === 0">
                             <div class="px-3 py-4 text-sm text-center" style="color: var(--text-tertiary);">
-                                No notes or folders yet.<br>Create your first note or folder!
+                                <span x-text="t('sidebar.no_notes_yet')"></span><br>
+                                <span x-text="t('sidebar.create_first')"></span>
                             </div>
                         </template>
                     </div>
@@ -1763,7 +1764,7 @@
                             <!-- Header -->
                             <div class="mb-6">
                                 <h1 class="text-3xl font-bold mb-2" style="color: var(--text-primary);" x-text="appName"></h1>
-                                <p class="text-lg" style="color: var(--text-secondary);" x-text="appTagline"></p>
+                                <p class="text-lg" style="color: var(--text-secondary);" x-text="t('app.tagline')"></p>
                                 <!-- Demo Mode Warning Banner -->
                                 <div x-data="{ showDemoBanner: false }" x-init="fetch('/api/config').then(r => r.json()).then(d => showDemoBanner = d.demoMode || false)" x-show="showDemoBanner" class="mt-4 flex items-center px-4 py-2.5 text-sm rounded-lg" style="background: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 100%); color: white; font-weight: 500;">
                                     <svg class="w-5 h-5 mr-2 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -1800,11 +1801,11 @@
                                     <div class="flex flex-wrap items-center gap-4 text-sm" style="color: var(--text-secondary);">
                                         <span class="font-semibold" style="color: var(--text-primary);">
                                             <span x-text="homepageNotes().length"></span> 
-                                            <span x-text="homepageNotes().length === 1 ? 'note' : 'notes'"></span>
+                                            <span x-text="homepageNotes().length === 1 ? t('homepage.note_singular') : t('homepage.note_plural')"></span>
                                         </span>
                                         <span x-show="homepageFolders().length > 0">
                                             <span x-text="homepageFolders().length"></span> 
-                                            <span x-text="homepageFolders().length === 1 ? 'folder' : 'folders'"></span>
+                                            <span x-text="homepageFolders().length === 1 ? t('homepage.folder_singular') : t('homepage.folder_plural')"></span>
                                         </span>
                                         <button 
                                             @click="dropdownTargetFolder = selectedHomepageFolder; toggleNewDropdown($event)"
@@ -1875,7 +1876,7 @@
                                             
                                             <!-- Folder Metadata -->
                                             <div class="flex items-center justify-between text-xs mt-auto pt-2" style="color: var(--text-tertiary);">
-                                                <span x-text="folder.noteCount + ' ' + (folder.noteCount === 1 ? 'note' : 'notes')"></span>
+                                                <span x-text="folder.noteCount + ' ' + (folder.noteCount === 1 ? t('homepage.note_singular') : t('homepage.note_plural'))"></span>
                                                 <svg class="w-4 h-4" style="color: var(--accent-primary);" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                                     <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path>
                                                 </svg>
diff --git a/locales/de-DE.json b/locales/de-DE.json
index 959a603..ae01308 100644
--- a/locales/de-DE.json
+++ b/locales/de-DE.json
@@ -5,6 +5,10 @@
     "flag": "🇩🇪"
   },
 
+  "app": {
+    "tagline": "Deine Selbstgehostete Wissensdatenbank"
+  },
+
   "common": {
     "save": "Speichern",
     "cancel": "Abbrechen",
@@ -37,6 +41,8 @@
     "drag_hint": "💡 Ziehen=Verschieben",
     "root_folder": "📂 Hauptordner",
     "no_notes": "Noch keine Notizen. Erstelle deine erste Notiz!",
+    "no_notes_yet": "Noch keine Notizen oder Ordner.",
+    "create_first": "Erstelle deine erste Notiz oder Ordner!",
     "no_favorites": "Noch keine Favoriten",
     "no_results": "Keine Ergebnisse gefunden",
     "expand_all": "Alle Ordner aufklappen",
@@ -86,7 +92,8 @@
     "prompt_name_with_path": "Neuen Ordner erstellen.\nOrdnerpfad eingeben (z.B. \"Projekte\" oder \"Arbeit/2025\"):",
     "prompt_rename": "Ordner \"{{name}}\" umbenennen zu:",
     "invalid_name": "Ungültiger Ordnername.",
-    "cannot_move_into_self": "Ordner kann nicht in sich selbst oder einen Unterordner verschoben werden."
+    "cannot_move_into_self": "Ordner kann nicht in sich selbst oder einen Unterordner verschoben werden.",
+    "empty": "leer"
   },
 
   "toolbar": {
@@ -178,7 +185,11 @@
     "get_started": "Erstelle etwas, um loszulegen",
     "no_notes_title": "Noch keine Notizen",
     "no_notes_desc": "Erstelle deine erste Notiz oder Ordner",
-    "folder_empty": "Dieser Ordner ist leer"
+    "folder_empty": "Dieser Ordner ist leer",
+    "note_singular": "Notiz",
+    "note_plural": "Notizen",
+    "folder_singular": "Ordner",
+    "folder_plural": "Ordner"
   }
 }
 
diff --git a/locales/en-US.json b/locales/en-US.json
index 40a56cb..8b5847d 100644
--- a/locales/en-US.json
+++ b/locales/en-US.json
@@ -5,6 +5,10 @@
     "flag": "🇺🇸"
   },
 
+  "app": {
+    "tagline": "Your Self-Hosted Knowledge Base"
+  },
+
   "common": {
     "save": "Save",
     "cancel": "Cancel",
@@ -37,6 +41,8 @@
     "drag_hint": "💡 Drag=Move",
     "root_folder": "📂 Root folder",
     "no_notes": "No notes yet. Create your first note!",
+    "no_notes_yet": "No notes or folders yet.",
+    "create_first": "Create your first note or folder!",
     "no_favorites": "No favorites yet",
     "no_results": "No results found",
     "expand_all": "Expand all folders",
@@ -86,7 +92,8 @@
     "prompt_name_with_path": "Create new folder.\nEnter folder path (e.g., \"Projects\" or \"Work/2025\"):",
     "prompt_rename": "Rename folder \"{{name}}\" to:",
     "invalid_name": "Invalid folder name.",
-    "cannot_move_into_self": "Cannot move folder into itself or its subfolder."
+    "cannot_move_into_self": "Cannot move folder into itself or its subfolder.",
+    "empty": "empty"
   },
 
   "toolbar": {
@@ -178,7 +185,11 @@
     "get_started": "Create something to get started",
     "no_notes_title": "No notes yet",
     "no_notes_desc": "Create your first note or folder",
-    "folder_empty": "This folder is empty"
+    "folder_empty": "This folder is empty",
+    "note_singular": "note",
+    "note_plural": "notes",
+    "folder_singular": "folder",
+    "folder_plural": "folders"
   }
 }
 
diff --git a/locales/es-ES.json b/locales/es-ES.json
index c7caaf4..6038fb2 100644
--- a/locales/es-ES.json
+++ b/locales/es-ES.json
@@ -5,6 +5,10 @@
     "flag": "🇪🇸"
   },
 
+  "app": {
+    "tagline": "Tu Base de Conocimientos Autoalojada"
+  },
+
   "common": {
     "save": "Guardar",
     "cancel": "Cancelar",
@@ -37,6 +41,8 @@
     "drag_hint": "💡 Arrastrar=Mover",
     "root_folder": "📂 Carpeta raíz",
     "no_notes": "Aún no hay notas. ¡Crea tu primera nota!",
+    "no_notes_yet": "Aún no hay notas ni carpetas.",
+    "create_first": "¡Crea tu primera nota o carpeta!",
     "no_favorites": "Aún no hay favoritos",
     "no_results": "No se encontraron resultados",
     "expand_all": "Expandir todas las carpetas",
@@ -86,7 +92,8 @@
     "prompt_name_with_path": "Crear nueva carpeta.\nIntroduce la ruta de la carpeta (ej., \"Proyectos\" o \"Trabajo/2025\"):",
     "prompt_rename": "Renombrar carpeta \"{{name}}\" a:",
     "invalid_name": "Nombre de carpeta inválido.",
-    "cannot_move_into_self": "No se puede mover una carpeta dentro de sí misma o de una subcarpeta."
+    "cannot_move_into_self": "No se puede mover una carpeta dentro de sí misma o de una subcarpeta.",
+    "empty": "vacía"
   },
 
   "toolbar": {
@@ -178,7 +185,11 @@
     "get_started": "Crea algo para empezar",
     "no_notes_title": "Aún no hay notas",
     "no_notes_desc": "Crea tu primera nota o carpeta",
-    "folder_empty": "Esta carpeta está vacía"
+    "folder_empty": "Esta carpeta está vacía",
+    "note_singular": "nota",
+    "note_plural": "notas",
+    "folder_singular": "carpeta",
+    "folder_plural": "carpetas"
   }
 }
 
diff --git a/locales/fr-FR.json b/locales/fr-FR.json
index bdc7769..0fe7095 100644
--- a/locales/fr-FR.json
+++ b/locales/fr-FR.json
@@ -5,6 +5,10 @@
     "flag": "🇫🇷"
   },
 
+  "app": {
+    "tagline": "Votre Base de Connaissances Auto-Hébergée"
+  },
+
   "common": {
     "save": "Enregistrer",
     "cancel": "Annuler",
@@ -37,6 +41,8 @@
     "drag_hint": "💡 Glisser=Déplacer",
     "root_folder": "📂 Dossier racine",
     "no_notes": "Pas encore de notes. Créez votre première note !",
+    "no_notes_yet": "Pas encore de notes ni de dossiers.",
+    "create_first": "Créez votre première note ou dossier !",
     "no_favorites": "Pas encore de favoris",
     "no_results": "Aucun résultat trouvé",
     "expand_all": "Développer tous les dossiers",
@@ -86,7 +92,8 @@
     "prompt_name_with_path": "Créer un nouveau dossier.\nEntrez le chemin du dossier (ex. \"Projets\" ou \"Travail/2025\") :",
     "prompt_rename": "Renommer le dossier \"{{name}}\" en :",
     "invalid_name": "Nom de dossier invalide.",
-    "cannot_move_into_self": "Impossible de déplacer un dossier dans lui-même ou dans un sous-dossier."
+    "cannot_move_into_self": "Impossible de déplacer un dossier dans lui-même ou dans un sous-dossier.",
+    "empty": "vide"
   },
 
   "toolbar": {
@@ -178,7 +185,11 @@
     "get_started": "Créez quelque chose pour commencer",
     "no_notes_title": "Pas encore de notes",
     "no_notes_desc": "Créez votre première note ou dossier",
-    "folder_empty": "Ce dossier est vide"
+    "folder_empty": "Ce dossier est vide",
+    "note_singular": "note",
+    "note_plural": "notes",
+    "folder_singular": "dossier",
+    "folder_plural": "dossiers"
   }
 }