diff --git a/src/components/debug/DebugInfo.tsx b/src/components/debug/DebugInfo.tsx
index b2a0c2e..d941402 100644
--- a/src/components/debug/DebugInfo.tsx
+++ b/src/components/debug/DebugInfo.tsx
@@ -13,6 +13,7 @@ import {
   Globe,
 } from "lucide-react";
 import { CacheType } from "@/lib/services/base-api.service";
+import { useTranslation } from "react-i18next";
 
 interface RequestTiming {
   url: string;
@@ -49,6 +50,7 @@ export function DebugInfo() {
   const [isMinimized, setIsMinimized] = useState(false);
   const [isRefreshing, setIsRefreshing] = useState(false);
   const pathname = usePathname();
+  const { t } = useTranslation();
 
   const fetchLogs = async () => {
     try {
@@ -100,10 +102,10 @@ export function DebugInfo() {
     >
       <div className="flex items-center justify-between mb-4 sticky top-0 bg-zinc-900 pb-2">
         <div className="flex items-center gap-2">
-          <h2 className="font-bold text-lg">DEBUG</h2>
+          <h2 className="font-bold text-lg">{t("debug.title")}</h2>
           {!isMinimized && (
             <span className="text-xs text-zinc-400">
-              {sortedLogs.length} entrée{sortedLogs.length > 1 ? "s" : ""}
+              {sortedLogs.length} {t("debug.entries", { count: sortedLogs.length })}
             </span>
           )}
         </div>
@@ -111,7 +113,7 @@ export function DebugInfo() {
           <button
             onClick={fetchLogs}
             className="hover:bg-zinc-700 rounded-full p-1.5"
-            aria-label="Rafraîchir les logs"
+            aria-label={t("debug.actions.refresh")}
             disabled={isRefreshing}
           >
             <RefreshCw className={`h-5 w-5 ${isRefreshing ? "animate-spin" : ""}`} />
@@ -119,14 +121,14 @@ export function DebugInfo() {
           <button
             onClick={() => setIsMinimized(!isMinimized)}
             className="hover:bg-zinc-700 rounded-full p-1.5"
-            aria-label={isMinimized ? "Agrandir" : "Minimiser"}
+            aria-label={t(isMinimized ? "debug.actions.maximize" : "debug.actions.minimize")}
           >
             {isMinimized ? <Maximize2 className="h-5 w-5" /> : <Minimize2 className="h-5 w-5" />}
           </button>
           <button
             onClick={clearLogs}
             className="hover:bg-zinc-700 rounded-full p-1.5"
-            aria-label="Effacer les logs"
+            aria-label={t("debug.actions.clear")}
           >
             <X className="h-5 w-5" />
           </button>
@@ -136,32 +138,40 @@ export function DebugInfo() {
       {!isMinimized && (
         <div className="space-y-3">
           {sortedLogs.length === 0 ? (
-            <p className="text-sm opacity-75">Aucune requête enregistrée</p>
+            <p className="text-sm opacity-75">{t("debug.noRequests")}</p>
           ) : (
             sortedLogs.map((log, index) => (
               <div key={index} className="text-sm space-y-1.5 bg-zinc-800 p-2 rounded">
                 <div className="flex justify-between items-center">
                   <div className="flex items-center gap-2 min-w-0 flex-1">
                     {log.fromCache && (
-                      <div title={`Cache: ${log.cacheType || "DEFAULT"}`} className="flex-shrink-0">
+                      <div
+                        title={t("debug.tooltips.cache", { type: log.cacheType || "DEFAULT" })}
+                        className="flex-shrink-0"
+                      >
                         <Database className="h-4 w-4" />
                       </div>
                     )}
                     {log.mongoAccess && (
                       <div
-                        title={`MongoDB: ${log.mongoAccess.operation}`}
+                        title={t("debug.tooltips.mongodb", {
+                          operation: log.mongoAccess.operation,
+                        })}
                         className="flex-shrink-0"
                       >
                         <CircleDot className="h-4 w-4 text-blue-400" />
                       </div>
                     )}
                     {log.pageRender && (
-                      <div title={`Page Render: ${log.pageRender.page}`} className="flex-shrink-0">
+                      <div
+                        title={t("debug.tooltips.pageRender", { page: log.pageRender.page })}
+                        className="flex-shrink-0"
+                      >
                         <Layout className="h-4 w-4 text-purple-400" />
                       </div>
                     )}
                     {!log.fromCache && !log.mongoAccess && !log.pageRender && (
-                      <div title="API Call" className="flex-shrink-0">
+                      <div title={t("debug.tooltips.apiCall")} className="flex-shrink-0">
                         <Globe className="h-4 w-4 text-rose-400" />
                       </div>
                     )}
@@ -170,7 +180,10 @@ export function DebugInfo() {
                     </span>
                   </div>
                   <div className="flex items-center gap-3 flex-shrink-0">
-                    <div className="flex items-center gap-1 text-zinc-400" title="Heure du log">
+                    <div
+                      className="flex items-center gap-1 text-zinc-400"
+                      title={t("debug.tooltips.logTime")}
+                    >
                       <Clock className="h-3 w-3" />
                       <span>{formatTime(log.timestamp)}</span>
                     </div>
@@ -188,7 +201,7 @@ export function DebugInfo() {
                       {formatDuration(log.duration)}ms
                     </span>
                     {log.mongoAccess && (
-                      <span className="text-blue-400" title="Temps d'accès MongoDB">
+                      <span className="text-blue-400" title={t("debug.tooltips.mongoAccess")}>
                         +{formatDuration(log.mongoAccess.duration)}ms
                       </span>
                     )}
diff --git a/src/components/layout/Header.tsx b/src/components/layout/Header.tsx
index cbdcc71..1c74b42 100644
--- a/src/components/layout/Header.tsx
+++ b/src/components/layout/Header.tsx
@@ -1,6 +1,7 @@
 import { Menu, Moon, Sun } from "lucide-react";
 import { useTheme } from "next-themes";
 import LanguageSelector from "@/components/LanguageSelector";
+import { useTranslation } from "react-i18next";
 
 interface HeaderProps {
   onToggleSidebar: () => void;
@@ -8,6 +9,7 @@ interface HeaderProps {
 
 export function Header({ onToggleSidebar }: HeaderProps) {
   const { theme, setTheme } = useTheme();
+  const { t } = useTranslation();
 
   const toggleTheme = () => {
     setTheme(theme === "dark" ? "light" : "dark");
@@ -19,7 +21,7 @@ export function Header({ onToggleSidebar }: HeaderProps) {
         <button
           onClick={onToggleSidebar}
           className="mr-2 px-2 py-1.5 hover:bg-accent hover:text-accent-foreground rounded-md"
-          aria-label="Toggle sidebar"
+          aria-label={t("header.toggleSidebar")}
           id="sidebar-toggle"
         >
           <div className="flex items-center justify-center w-5 h-5">
@@ -39,13 +41,13 @@ export function Header({ onToggleSidebar }: HeaderProps) {
             <button
               onClick={toggleTheme}
               className="px-2 py-1.5 hover:bg-accent hover:text-accent-foreground rounded-md"
-              aria-label="Toggle theme"
+              aria-label={t("header.toggleTheme")}
             >
               <div className="relative flex items-center  w-5 h-5">
                 <Sun className="absolute inset-0 h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
                 <Moon className="absolute inset-0 h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
               </div>
-              <span className="sr-only">Toggle theme</span>
+              <span className="sr-only">{t("header.toggleTheme")}</span>
             </button>
           </nav>
         </div>
diff --git a/src/components/library/RefreshButton.tsx b/src/components/library/RefreshButton.tsx
index 60a424e..f747308 100644
--- a/src/components/library/RefreshButton.tsx
+++ b/src/components/library/RefreshButton.tsx
@@ -5,6 +5,7 @@ import { RefreshCw } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { useToast } from "@/components/ui/use-toast";
 import { cn } from "@/lib/utils";
+import { useTranslation } from "react-i18next";
 
 interface RefreshButtonProps {
   libraryId: string;
@@ -14,6 +15,7 @@ interface RefreshButtonProps {
 export function RefreshButton({ libraryId, refreshLibrary }: RefreshButtonProps) {
   const [isRefreshing, setIsRefreshing] = useState(false);
   const { toast } = useToast();
+  const { t } = useTranslation();
 
   const handleRefresh = async () => {
     setIsRefreshing(true);
@@ -22,8 +24,8 @@ export function RefreshButton({ libraryId, refreshLibrary }: RefreshButtonProps)
 
       if (result.success) {
         toast({
-          title: "Bibliothèque rafraîchie",
-          description: "La bibliothèque a été rafraîchie avec succès",
+          title: t("library.refresh.success.title"),
+          description: t("library.refresh.success.description"),
         });
       } else {
         throw new Error(result.error);
@@ -31,8 +33,9 @@ export function RefreshButton({ libraryId, refreshLibrary }: RefreshButtonProps)
     } catch (error) {
       toast({
         variant: "destructive",
-        title: "Erreur",
-        description: error instanceof Error ? error.message : "Une erreur est survenue",
+        title: t("library.refresh.error.title"),
+        description:
+          error instanceof Error ? error.message : t("library.refresh.error.description"),
       });
     } finally {
       setIsRefreshing(false);
@@ -46,7 +49,7 @@ export function RefreshButton({ libraryId, refreshLibrary }: RefreshButtonProps)
       onClick={handleRefresh}
       disabled={isRefreshing}
       className="ml-2"
-      aria-label="Rafraîchir la bibliothèque"
+      aria-label={t("library.refresh.button")}
     >
       <RefreshCw className={cn("h-4 w-4", isRefreshing && "animate-spin")} />
     </Button>
diff --git a/src/components/reader/components/ControlButtons.tsx b/src/components/reader/components/ControlButtons.tsx
index 9fd4c2b..70942a5 100644
--- a/src/components/reader/components/ControlButtons.tsx
+++ b/src/components/reader/components/ControlButtons.tsx
@@ -118,7 +118,7 @@ export const ControlButtons = ({
             "absolute top-4 right-4 p-2 rounded-full bg-background/50 hover:bg-background/80 transition-all duration-300 z-30",
             showControls ? "opacity-100" : "opacity-0 pointer-events-none"
           )}
-          aria-label="Fermer"
+          aria-label={t("reader.controls.close")}
         >
           <X className="h-6 w-6" />
         </button>
@@ -136,7 +136,7 @@ export const ControlButtons = ({
             direction === "rtl" ? "right-4" : "left-4",
             showControls ? "opacity-100" : "opacity-0 pointer-events-none"
           )}
-          aria-label="Page précédente"
+          aria-label={t("reader.controls.previousPage")}
         >
           <ChevronLeft className="h-8 w-8" />
         </button>
@@ -154,7 +154,7 @@ export const ControlButtons = ({
             direction === "rtl" ? "left-4" : "right-4",
             showControls ? "opacity-100" : "opacity-0 pointer-events-none"
           )}
-          aria-label="Page suivante"
+          aria-label={t("reader.controls.nextPage")}
         >
           <ChevronRight className="h-8 w-8" />
         </button>
diff --git a/src/components/ui/mark-as-read-button.tsx b/src/components/ui/mark-as-read-button.tsx
index 49333c2..7260f7a 100644
--- a/src/components/ui/mark-as-read-button.tsx
+++ b/src/components/ui/mark-as-read-button.tsx
@@ -5,6 +5,7 @@ import { Button } from "./button";
 import { useToast } from "./use-toast";
 import { ClientOfflineBookService } from "@/lib/services/client-offlinebook.service";
 import { useState } from "react";
+import { useTranslation } from "react-i18next";
 
 interface MarkAsReadButtonProps {
   bookId: string;
@@ -23,6 +24,7 @@ export function MarkAsReadButton({
 }: MarkAsReadButtonProps) {
   const { toast } = useToast();
   const [isLoading, setIsLoading] = useState(false);
+  const { t } = useTranslation();
 
   const handleMarkAsRead = async (e: React.MouseEvent) => {
     e.stopPropagation(); // Empêcher la propagation au parent
@@ -38,19 +40,19 @@ export function MarkAsReadButton({
       });
 
       if (!response.ok) {
-        throw new Error("Erreur lors de la mise à jour");
+        throw new Error(t("books.actions.markAsRead.error.update"));
       }
 
       toast({
-        title: "Succès",
-        description: "Le tome a été marqué comme lu",
+        title: t("books.actions.markAsRead.success.title"),
+        description: t("books.actions.markAsRead.success.description"),
       });
       onSuccess?.();
     } catch (error) {
       console.error("Erreur lors de la mise à jour du progresseur de lecture:", error);
       toast({
-        title: "Erreur",
-        description: "Impossible de marquer le tome comme lu",
+        title: t("books.actions.markAsRead.error.title"),
+        description: t("books.actions.markAsRead.error.description"),
         variant: "destructive",
       });
     } finally {
@@ -65,7 +67,7 @@ export function MarkAsReadButton({
       onClick={handleMarkAsRead}
       className={`h-8 w-8 p-0 rounded-br-lg rounded-tl-lg ${className}`}
       disabled={isRead || isLoading}
-      aria-label="Marquer comme lu"
+      aria-label={t("books.actions.markAsRead.button")}
     >
       {isLoading ? <Loader2 className="h-5 w-5 animate-spin" /> : <BookCheck className="h-5 w-5" />}
     </Button>
diff --git a/src/components/ui/mark-as-unread-button.tsx b/src/components/ui/mark-as-unread-button.tsx
index fc577aa..941a602 100644
--- a/src/components/ui/mark-as-unread-button.tsx
+++ b/src/components/ui/mark-as-unread-button.tsx
@@ -5,6 +5,7 @@ import { Button } from "./button";
 import { useToast } from "./use-toast";
 import { ClientOfflineBookService } from "@/lib/services/client-offlinebook.service";
 import { useState } from "react";
+import { useTranslation } from "react-i18next";
 
 interface MarkAsUnreadButtonProps {
   bookId: string;
@@ -15,6 +16,7 @@ interface MarkAsUnreadButtonProps {
 export function MarkAsUnreadButton({ bookId, onSuccess, className }: MarkAsUnreadButtonProps) {
   const { toast } = useToast();
   const [isLoading, setIsLoading] = useState(false);
+  const { t } = useTranslation();
 
   const handleMarkAsUnread = async (e: React.MouseEvent) => {
     e.stopPropagation(); // Empêcher la propagation au parent
@@ -26,19 +28,19 @@ export function MarkAsUnreadButton({ bookId, onSuccess, className }: MarkAsUnrea
       });
 
       if (!response.ok) {
-        throw new Error("Erreur lors de la mise à jour");
+        throw new Error(t("books.actions.markAsUnread.error.update"));
       }
 
       toast({
-        title: "Succès",
-        description: "Le tome a été marqué comme non lu",
+        title: t("books.actions.markAsUnread.success.title"),
+        description: t("books.actions.markAsUnread.success.description"),
       });
       onSuccess?.();
     } catch (error) {
       console.error("Erreur lors de la mise à jour du progresseur de lecture:", error);
       toast({
-        title: "Erreur",
-        description: "Impossible de marquer le tome comme non lu",
+        title: t("books.actions.markAsUnread.error.title"),
+        description: t("books.actions.markAsUnread.error.description"),
         variant: "destructive",
       });
     } finally {
@@ -53,7 +55,7 @@ export function MarkAsUnreadButton({ bookId, onSuccess, className }: MarkAsUnrea
       onClick={handleMarkAsUnread}
       className={`h-8 w-8 p-0 rounded-br-lg rounded-tl-lg ${className}`}
       disabled={isLoading}
-      aria-label="Marquer comme non lu"
+      aria-label={t("books.actions.markAsUnread.button")}
     >
       {isLoading ? <Loader2 className="h-5 w-5 animate-spin" /> : <BookX className="h-5 w-5" />}
     </Button>
diff --git a/src/i18n/messages/en/common.json b/src/i18n/messages/en/common.json
index 7d693e7..86f31cb 100644
--- a/src/i18n/messages/en/common.json
+++ b/src/i18n/messages/en/common.json
@@ -146,7 +146,18 @@
       "available": "Available",
       "unavailable": "Unavailable"
     },
-    "lastUpdated": "Last updated: {date}"
+    "lastUpdated": "Last updated: {date}",
+    "refresh": {
+      "button": "Refresh library",
+      "success": {
+        "title": "Library refreshed",
+        "description": "The library has been refreshed successfully"
+      },
+      "error": {
+        "title": "Error",
+        "description": "An error occurred"
+      }
+    }
   },
   "series": {
     "empty": "No series available",
@@ -180,7 +191,9 @@
       "favorite": {
         "add": "Added to favorites",
         "remove": "Removed from favorites"
-      }
+      },
+      "toggleSidebar": "Toggle sidebar",
+      "toggleTheme": "Toggle theme"
     }
   },
   "books": {
@@ -200,7 +213,33 @@
       "showAll": "Show all",
       "unread": "Unread"
     },
-    "loading": "Loading..."
+    "loading": "Loading...",
+    "actions": {
+      "markAsRead": {
+        "button": "Mark as read",
+        "success": {
+          "title": "Success",
+          "description": "Book has been marked as read"
+        },
+        "error": {
+          "title": "Error",
+          "description": "Unable to mark book as read",
+          "update": "Error updating status"
+        }
+      },
+      "markAsUnread": {
+        "button": "Mark as unread",
+        "success": {
+          "title": "Success",
+          "description": "Book has been marked as unread"
+        },
+        "error": {
+          "title": "Error",
+          "description": "Unable to mark book as unread",
+          "update": "Error updating status"
+        }
+      }
+    }
   },
   "downloads": {
     "page": {
@@ -278,7 +317,30 @@
       "fullscreen": {
         "enter": "Enter fullscreen",
         "exit": "Exit fullscreen"
-      }
+      },
+      "close": "Close",
+      "previousPage": "Previous page",
+      "nextPage": "Next page"
+    }
+  },
+  "debug": {
+    "title": "DEBUG",
+    "entries": "entry",
+    "entries_plural": "entries",
+    "noRequests": "No recorded requests",
+    "actions": {
+      "refresh": "Refresh logs",
+      "maximize": "Maximize",
+      "minimize": "Minimize",
+      "clear": "Clear logs"
+    },
+    "tooltips": {
+      "cache": "Cache: {{type}}",
+      "mongodb": "MongoDB: {{operation}}",
+      "pageRender": "Page Render: {{page}}",
+      "apiCall": "API Call",
+      "logTime": "Log time",
+      "mongoAccess": "MongoDB access time"
     }
   }
 }
diff --git a/src/i18n/messages/fr/common.json b/src/i18n/messages/fr/common.json
index 5f0ee50..c0a9fc4 100644
--- a/src/i18n/messages/fr/common.json
+++ b/src/i18n/messages/fr/common.json
@@ -146,7 +146,18 @@
       "available": "Disponible",
       "unavailable": "Non disponible"
     },
-    "lastUpdated": "Dernière mise à jour : {date}"
+    "lastUpdated": "Dernière mise à jour : {date}",
+    "refresh": {
+      "button": "Rafraîchir la bibliothèque",
+      "success": {
+        "title": "Bibliothèque rafraîchie",
+        "description": "La bibliothèque a été rafraîchie avec succès"
+      },
+      "error": {
+        "title": "Erreur",
+        "description": "Une erreur est survenue"
+      }
+    }
   },
   "series": {
     "empty": "Aucune série disponible",
@@ -200,7 +211,33 @@
       "showAll": "Afficher tout",
       "unread": "À lire"
     },
-    "loading": "Chargement..."
+    "loading": "Chargement...",
+    "actions": {
+      "markAsRead": {
+        "button": "Marquer comme lu",
+        "success": {
+          "title": "Succès",
+          "description": "Le tome a été marqué comme lu"
+        },
+        "error": {
+          "title": "Erreur",
+          "description": "Impossible de marquer le tome comme lu",
+          "update": "Erreur lors de la mise à jour"
+        }
+      },
+      "markAsUnread": {
+        "button": "Marquer comme non lu",
+        "success": {
+          "title": "Succès",
+          "description": "Le tome a été marqué comme non lu"
+        },
+        "error": {
+          "title": "Erreur",
+          "description": "Impossible de marquer le tome comme non lu",
+          "update": "Erreur lors de la mise à jour"
+        }
+      }
+    }
   },
   "downloads": {
     "page": {
@@ -278,7 +315,34 @@
       "fullscreen": {
         "enter": "Plein écran",
         "exit": "Quitter le plein écran"
-      }
+      },
+      "close": "Fermer",
+      "previousPage": "Page précédente",
+      "nextPage": "Page suivante"
+    }
+  },
+  "header": {
+    "toggleSidebar": "Afficher/masquer le menu latéral",
+    "toggleTheme": "Changer le thème"
+  },
+  "debug": {
+    "title": "DEBUG",
+    "entries": "entrée",
+    "entries_plural": "entrées",
+    "noRequests": "Aucune requête enregistrée",
+    "actions": {
+      "refresh": "Rafraîchir les logs",
+      "maximize": "Agrandir",
+      "minimize": "Minimiser",
+      "clear": "Effacer les logs"
+    },
+    "tooltips": {
+      "cache": "Cache: {{type}}",
+      "mongodb": "MongoDB: {{operation}}",
+      "pageRender": "Page Render: {{page}}",
+      "apiCall": "API Call",
+      "logTime": "Heure du log",
+      "mongoAccess": "Temps d'accès MongoDB"
     }
   }
 }