diff --git a/front/package-lock.json b/front/package-lock.json
index 3dc36a9..bf556a6 100644
--- a/front/package-lock.json
+++ b/front/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "pinia": "^3.0.3",
         "vue": "^3.5.18",
+        "vue-i18n": "^11.1.12",
         "vue-router": "^4.5.1"
       },
       "devDependencies": {
@@ -1161,6 +1162,50 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@intlify/core-base": {
+      "version": "11.1.12",
+      "resolved": "https://registry.npmjs.org/@intlify/core-base/-/core-base-11.1.12.tgz",
+      "integrity": "sha512-whh0trqRsSqVLNEUCwU59pyJZYpU8AmSWl8M3Jz2Mv5ESPP6kFh4juas2NpZ1iCvy7GlNRffUD1xr84gceimjg==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/message-compiler": "11.1.12",
+        "@intlify/shared": "11.1.12"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
+    "node_modules/@intlify/message-compiler": {
+      "version": "11.1.12",
+      "resolved": "https://registry.npmjs.org/@intlify/message-compiler/-/message-compiler-11.1.12.tgz",
+      "integrity": "sha512-Fv9iQSJoJaXl4ZGkOCN1LDM3trzze0AS2zRz2EHLiwenwL6t0Ki9KySYlyr27yVOj5aVz0e55JePO+kELIvfdQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/shared": "11.1.12",
+        "source-map-js": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
+    "node_modules/@intlify/shared": {
+      "version": "11.1.12",
+      "resolved": "https://registry.npmjs.org/@intlify/shared/-/shared-11.1.12.tgz",
+      "integrity": "sha512-Om86EjuQtA69hdNj3GQec9ZC0L0vPSAnXzB3gP/gyJ7+mA7t06d9aOAiqMZ+xEOsumGP4eEBlfl8zF2LOTzf2A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -4050,6 +4095,26 @@
         "eslint": "^8.57.0 || ^9.0.0"
       }
     },
+    "node_modules/vue-i18n": {
+      "version": "11.1.12",
+      "resolved": "https://registry.npmjs.org/vue-i18n/-/vue-i18n-11.1.12.tgz",
+      "integrity": "sha512-BnstPj3KLHLrsqbVU2UOrPmr0+Mv11bsUZG0PyCOzsawCivk8W00GMXHeVUWIDOgNaScCuZah47CZFE+Wnl8mw==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/core-base": "11.1.12",
+        "@intlify/shared": "11.1.12",
+        "@vue/devtools-api": "^6.5.0"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      },
+      "peerDependencies": {
+        "vue": "^3.0.0"
+      }
+    },
     "node_modules/vue-router": {
       "version": "4.5.1",
       "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-4.5.1.tgz",
diff --git a/front/package.json b/front/package.json
index 5d519ea..0f1260e 100644
--- a/front/package.json
+++ b/front/package.json
@@ -16,6 +16,7 @@
   "dependencies": {
     "pinia": "^3.0.3",
     "vue": "^3.5.18",
+    "vue-i18n": "^11.1.12",
     "vue-router": "^4.5.1"
   },
   "devDependencies": {
diff --git a/front/src/AddBook.vue b/front/src/AddBook.vue
index a78c4f1..17fea5b 100644
--- a/front/src/AddBook.vue
+++ b/front/src/AddBook.vue
@@ -45,23 +45,24 @@
 <template>
   <form @submit.prevent="onSubmit">
     <div class="field">
-      <label class="label">Title</label>
+      <label class="label">{{$t('addbook.title')}}</label>
       <div class="control">
         <input :class="'input ' + (titleError ? 'is-danger' : '')" type="text" maxlength="300"
-        required v-model="book.title" placeholder="Title">
+        required v-model="book.title" :placeholder="$t('addbook.title')">
       </div>
       <p v-if="titleError" class="help is-danger">{{titleError}}</p>
     </div>
     <div class="field">
-      <label class="label">Author</label>
+      <label class="label">{{$t('addbook.author')}}</label>
       <div class="control">
-        <input :class="'input ' + (authorError ? 'is-danger' : '')" type="text" maxlength="100" v-model="book.author" placeholder="Author">
+        <input :class="'input ' + (authorError ? 'is-danger' : '')" type="text" maxlength="100"
+        v-model="book.author" :placeholder="$t('addbook.author')">
       </div>
       <p v-if="authorError" class="help is-danger">{{authorError}}</p>
     </div>
     <div class="field">
       <div class="control">
-        <button class="button is-link">Submit</button>
+        <button class="button is-link">{{$t('addbook.submit')}}</button>
       </div>
     </div>
   </form>
diff --git a/front/src/AppNavBar.vue b/front/src/AppNavBar.vue
index 828f24c..604356b 100644
--- a/front/src/AppNavBar.vue
+++ b/front/src/AppNavBar.vue
@@ -15,13 +15,13 @@
     <div class="navbar-menu">
       <div class="navbar-start">
         <RouterLink to="/" class="navbar-item" activeClass="is-active">
-          Home
-        </RouterLink>
-        <RouterLink v-if="authStore.user" to="/add" class="navbar-item" activeClass="is-active">
-          Add Book
+        {{ $t('navbar.home')}}
         </RouterLink>
         <RouterLink v-if="authStore.user" to="/books" class="navbar-item" activeClass="is-active">
-          My Books
+          {{ $t('navbar.mybooks')}}
+        </RouterLink>
+        <RouterLink v-if="authStore.user" to="/add" class="navbar-item" activeClass="is-active">
+          {{ $t('navbar.addbook')}}
         </RouterLink>
       </div>
       <div class="navbar-end">
@@ -34,16 +34,16 @@
            {{ authStore.user.username }}
         </div>
         <a @click="authStore.logout" class="button is-light">
-          Log out
+          {{ $t('navbar.logout')}}
         </a>
       </div>
       <div v-else class="navbar-item">
         <div  class="buttons">
           <RouterLink to="/signup" class="button is-primary">
-            <strong>Sign up</strong>
+            <strong>{{ $t('navbar.signup')}}</strong>
           </RouterLink>
           <RouterLink to="/login" class="button is-light">
-            Log in
+            {{ $t('navbar.login')}}
           </RouterLink>
         </div>
       </div>
diff --git a/front/src/BooksBrowser.vue b/front/src/BooksBrowser.vue
index b1dab31..601dcb8 100644
--- a/front/src/BooksBrowser.vue
+++ b/front/src/BooksBrowser.vue
@@ -9,11 +9,11 @@ const { data, error } = getMyBooks();
 <template>
   <div class="books">
 
-    <div v-if="error">Error when loading books: {{ error.message }}</div>
+    <div v-if="error">{{$t('bookbrowser.error', {error: error.message})}}</div>
     <div class="book" v-else-if="data" v-for="book in data" :key="book.id">
       <BookCard v-bind="book" />
     </div>
-  <div v-else>Loading...</div>
+    <div v-else>{{$t('bookbrowser.loading')}}</div>
   </div>
 </template>
 
diff --git a/front/src/Home.vue b/front/src/Home.vue
index 0920b9f..0a869db 100644
--- a/front/src/Home.vue
+++ b/front/src/Home.vue
@@ -7,10 +7,10 @@
 
 <template>
   <div v-if="authStore.user">
-    Welcome {{ authStore.user.username }} !
+    {{ $t('home.welcomeuser', {username: authStore.user.username}) }}
   </div>
   <div v-else>
-    Welcome to PersonalLibraryManager. Please login ou sign in to continue.
+    {{ $t('home.welcome') }}
   </div>
 </template>
 
diff --git a/front/src/LogIn.vue b/front/src/LogIn.vue
index d3408a6..a2f2bd9 100644
--- a/front/src/LogIn.vue
+++ b/front/src/LogIn.vue
@@ -47,24 +47,24 @@
   </div>
   <form class="box" @submit.prevent="onSubmit">
     <div class="field">
-      <label class="label">Username</label>
+      <label class="label">{{$t('login.username')}}</label>
       <div class="control">
         <input :class="'input ' + (userError ? 'is-danger' : '')" type="text" minlength="2" maxlength="20"
-        required v-model="user.username" placeholder="Username">
+        required v-model="user.username" :placeholder="$t('login.username')">
       </div>
       <p v-if="userError" class="help is-danger">{{userError}}</p>
     </div>
     <div class="field">
-      <label class="label">Password</label>
+      <label class="label">{{$t('login.password')}}</label>
       <div class="control">
         <input :class="'input ' + (passwordError ? 'is-danger' : '')" type="password" minlength="6"
-        maxlength="100" v-model="user.password" required placeholder="Password">
+        maxlength="100" v-model="user.password" required :placeholder="$t('login.password')">
       </div>
       <p v-if="passwordError" class="help is-danger">{{passwordError}}</p>
     </div>
     <div class="field">
       <div class="control">
-        <button class="button is-link">Log In</button>
+        <button class="button is-link">{{$t('login.login')}}</button>
       </div>
     </div>
   </form>
diff --git a/front/src/SignUp.vue b/front/src/SignUp.vue
index ded7d24..4e38a4e 100644
--- a/front/src/SignUp.vue
+++ b/front/src/SignUp.vue
@@ -41,24 +41,24 @@
   </div>
   <form class="box" @submit.prevent="onSubmit">
     <div class="field">
-      <label class="label">Username</label>
+      <label class="label">{{$t('signup.username')}}</label>
       <div class="control">
         <input :class="'input ' + (userError ? 'is-danger' : '')" type="text" minlength="2" maxlength="20"
-        required v-model="user.username" placeholder="Username">
+        required v-model="user.username" :placeholder="$t('signup.username')">
       </div>
       <p v-if="userError" class="help is-danger">{{userError}}</p>
     </div>
     <div class="field">
-      <label class="label">Password</label>
+      <label class="label">{{ $t('signup.password') }}</label>
       <div class="control">
         <input :class="'input ' + (passwordError ? 'is-danger' : '')" type="password" minlength="6"
-        maxlength="100" v-model="user.password" required placeholder="Password">
+        maxlength="100" v-model="user.password" required :placeholder="$t('signup.password')">
       </div>
       <p v-if="passwordError" class="help is-danger">{{passwordError}}</p>
     </div>
     <div class="field">
       <div class="control">
-        <button class="button is-link">Sign In</button>
+        <button class="button is-link">{{ $t('signup.signup') }}</button>
       </div>
     </div>
   </form>
diff --git a/front/src/locales/en.json b/front/src/locales/en.json
new file mode 100644
index 0000000..2015cf4
--- /dev/null
+++ b/front/src/locales/en.json
@@ -0,0 +1,33 @@
+{
+  "home": {
+    "welcomeuser": "Welcome {username} !",
+    "welcome": "Welcome to PersonalLibraryManager. Please login ou sign in to continue."
+  },
+  "navbar": {
+    "home": "Home",
+    "mybooks": "My Books",
+    "addbook": "Add Book",
+    "logout": "Log out",
+    "signup": "Sign up",
+    "login": "Log In"
+  },
+  "addbook": {
+    "title":"Title",
+    "author":"Author",
+    "submit":"Submit"
+  },
+  "signup": {
+    "username":"Username",
+    "password":"Password",
+    "signup":"Sign up"
+  },
+  "login": {
+    "username":"Username",
+    "password":"Password",
+    "login":"Log in"
+  },
+  "bookbrowser": {
+    "error": "Error when loading books: {error}",
+    "loading": "Loading..."
+  }
+}
diff --git a/front/src/locales/fr.json b/front/src/locales/fr.json
new file mode 100644
index 0000000..74d1c02
--- /dev/null
+++ b/front/src/locales/fr.json
@@ -0,0 +1,33 @@
+{
+  "home": {
+    "welcomeuser": "Bienvenue {username} !",
+    "welcome": "Bienvenue sur PersonalLibraryManager. Merci de se connecter ou de s'inscrire pour continuer."
+  },
+  "navbar": {
+    "home": "Accueil",
+    "mybooks": "Mes Livres",
+    "addbook": "Ajouter Un Livre",
+    "logout": "Se déconnecter",
+    "signup": "S'inscrire",
+    "login": "Se connecter"
+  },
+  "addbook": {
+    "title":"Titre",
+    "author":"Auteur",
+    "submit":"Confirmer"
+  },
+  "signup": {
+    "username":"Nom d'utilisateur",
+    "password":"Mot de passe",
+    "signup":"S'inscrire"
+  },
+  "login": {
+    "username":"Nom d'utilisateur",
+    "password":"Mot de passe",
+    "login":"Connexion"
+  },
+  "bookbrowser": {
+    "error": "Erreur pendant le chargement des livres: {error}",
+    "loading": "Chargement..."
+  }
+}
diff --git a/front/src/main.js b/front/src/main.js
index cdbf9b8..29f892d 100644
--- a/front/src/main.js
+++ b/front/src/main.js
@@ -1,4 +1,5 @@
 import { createApp } from 'vue'
+import { createI18n } from "vue-i18n";
 import { createPinia } from 'pinia'
 import { createRouter, createWebHistory } from 'vue-router'
 import App from './App.vue'
@@ -8,6 +9,17 @@ import SignUp from './SignUp.vue'
 import LogIn from './LogIn.vue'
 import Home from './Home.vue'
 
+import fr from './locales/fr.json';
+import en from './locales/en.json';
+
+
+// configure i18n
+const i18n = createI18n({
+    locale: navigator.language,
+    fallbackLocale: "en",
+    messages: { fr, en },
+});
+
 
 const routes = [
   { path: '/', component: Home },
@@ -24,4 +36,4 @@ export const router = createRouter({
 
 const pinia = createPinia()
 
-createApp(App).use(pinia).use(router).mount('#app')
+createApp(App).use(i18n).use(pinia).use(router).mount('#app')
diff --git a/go.mod b/go.mod
index ceb2877..e94d3f6 100644
--- a/go.mod
+++ b/go.mod
@@ -34,6 +34,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.22 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/nicksnyder/go-i18n/v2 v2.6.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
@@ -42,7 +43,7 @@ require (
 	golang.org/x/crypto v0.42.0 // indirect
 	golang.org/x/net v0.44.0 // indirect
 	golang.org/x/sys v0.36.0 // indirect
-	golang.org/x/text v0.29.0 // indirect
+	golang.org/x/text v0.30.0 // indirect
 	google.golang.org/protobuf v1.36.9 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 9ed2b7f..173d550 100644
--- a/go.sum
+++ b/go.sum
@@ -56,6 +56,8 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
 github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
+github.com/nicksnyder/go-i18n/v2 v2.6.0 h1:C/m2NNWNiTB6SK4Ao8df5EWm3JETSTIGNXBpMJTxzxQ=
+github.com/nicksnyder/go-i18n/v2 v2.6.0/go.mod h1:88sRqr0C6OPyJn0/KRNaEz1uWorjxIKP7rUUcvycecE=
 github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
 github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
@@ -88,6 +90,8 @@ golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=
 golang.org/x/sys v0.36.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
 golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
+golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
+golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
 google.golang.org/protobuf v1.36.9 h1:w2gp2mA27hUeUzj9Ex9FBjsBm40zfaDtEWow293U7Iw=
 google.golang.org/protobuf v1.36.9/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/internal/api/routes.go b/internal/api/routes.go
index 664653d..3ab97da 100644
--- a/internal/api/routes.go
+++ b/internal/api/routes.go
@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"net/http"
 
+	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
+	"git.artlef.fr/PersonalLibraryManager/internal/i18nresource"
 	"git.artlef.fr/PersonalLibraryManager/internal/jwtauth"
 	"git.artlef.fr/PersonalLibraryManager/internal/model"
 	"github.com/gin-gonic/gin"
@@ -13,84 +15,84 @@ import (
 	"gorm.io/gorm"
 )
 
-func GetMyBooksHanderl(c *gin.Context, db *gorm.DB) {
+func GetMyBooksHanderl(ac appcontext.AppContext) {
 	var userbooks []model.UserBook
-	user, err := getAuthenticatedUser(c, db)
+	user, err := getAuthenticatedUser(ac)
 	if err != nil {
-		manageDefaultError(c, err)
+		manageDefaultError(ac.C, err)
 		return
 	}
-	db.Preload("Book").Where("user_id = ?", user.ID).Find(&userbooks)
+	ac.Db.Preload("Book").Where("user_id = ?", user.ID).Find(&userbooks)
 	var booksDto []bookUserGet
 	for _, userbook := range userbooks {
 		booksDto = append(booksDto, fromUserBookDb(&userbook))
 	}
-	c.JSON(http.StatusOK, booksDto)
+	ac.C.JSON(http.StatusOK, booksDto)
 }
 
-func PostBookHandler(c *gin.Context, db *gorm.DB) {
+func PostBookHandler(ac appcontext.AppContext) {
 	var book bookPostCreate
-	err := c.ShouldBindJSON(&book)
+	err := ac.C.ShouldBindJSON(&book)
 	if err != nil {
-		manageBindingError(c, err)
+		manageBindingError(ac, err)
 		return
 	}
-	user, fetchUserErr := getAuthenticatedUser(c, db)
+	user, fetchUserErr := getAuthenticatedUser(ac)
 	if fetchUserErr != nil {
-		manageDefaultError(c, err)
+		manageDefaultError(ac.C, err)
 		return
 	}
 	bookDb := book.toBook(&user)
-	err = db.Model(&model.Book{}).Save(&bookDb).Error
+	err = ac.Db.Model(&model.Book{}).Save(&bookDb).Error
 	if err != nil {
-		manageDefaultError(c, err)
+		manageDefaultError(ac.C, err)
 		return
 	}
-	c.String(200, "Success")
+	ac.C.String(200, "Success")
 }
 
-func PostSignupHandler(c *gin.Context, db *gorm.DB) {
+func PostSignupHandler(ac appcontext.AppContext) {
 	var user userSignup
-	err := c.ShouldBindJSON(&user)
+	err := ac.C.ShouldBindJSON(&user)
 	if err != nil {
-		manageBindingError(c, err)
+		manageBindingError(ac, err)
 		return
 	}
 	userDb, err := user.toUser()
 	if err != nil {
-		manageDefaultError(c, err)
+		manageDefaultError(ac.C, err)
 		return
 	}
-	err = db.Model(&model.User{}).Save(&userDb).Error
+	err = ac.Db.Model(&model.User{}).Save(&userDb).Error
 	if err != nil {
-		manageDefaultError(c, err)
+		manageDefaultError(ac.C, err)
 		return
 	}
-	c.String(200, "Success")
+	ac.C.String(200, "Success")
 }
 
-func PostLoginHandler(c *gin.Context, db *gorm.DB) {
+func PostLoginHandler(ac appcontext.AppContext) {
 	var user userLogin
-	err := c.ShouldBindJSON(&user)
+	err := ac.C.ShouldBindJSON(&user)
 	if err != nil {
-		manageBindingError(c, err)
+		manageBindingError(ac, err)
 		return
 	}
 
-	if !isUserAndPasswordOk(db, user.Username, user.Password) {
-		c.JSON(http.StatusInternalServerError,
-			gin.H{"error": "Invalid credentials."})
+	if !isUserAndPasswordOk(ac.Db, user.Username, user.Password) {
+		ac.C.JSON(http.StatusInternalServerError,
+			gin.H{"error": i18nresource.GetTranslatedMessage(ac, "InvalidCredentials")})
 		return
 	}
 
 	var jwtToken string
 	jwtToken, err = jwtauth.GenerateJwtToken(user.Username)
 	if err != nil {
-		c.JSON(http.StatusUnauthorized,
+		ac.C.JSON(http.StatusUnauthorized,
 			gin.H{"error": fmt.Errorf("Error when generating JWT token: %w", err)})
 		return
 	}
-	c.JSON(200, gin.H{"message": "Authentication was a success.", "token": jwtToken})
+	ac.C.JSON(200, gin.H{"message": i18nresource.GetTranslatedMessage(ac, "AuthenticationSuccess"), "token": jwtToken})
 }
 
 func isUserAndPasswordOk(db *gorm.DB, username string, password string) bool {
@@ -100,22 +102,22 @@ func isUserAndPasswordOk(db *gorm.DB, username string, password string) bool {
 	return err == nil
 }
 
-func getAuthenticatedUser(c *gin.Context, db *gorm.DB) (model.User, error) {
+func getAuthenticatedUser(ac appcontext.AppContext) (model.User, error) {
 	var user model.User
-	username, userIsInContext := c.Get("user")
+	username, userIsInContext := ac.C.Get("user")
 	if !userIsInContext {
 		return user, errors.New("User not found in context")
 	}
-	res := db.Where("name = ?", username).First(&user)
+	res := ac.Db.Where("name = ?", username).First(&user)
 	return user, res.Error
 }
 
-func manageBindingError(c *gin.Context, err error) {
+func manageBindingError(ac appcontext.AppContext, err error) {
 	var ve validator.ValidationErrors
 	if errors.As(err, &ve) {
-		c.JSON(http.StatusBadRequest, getValidationErrors(&ve))
+		ac.C.JSON(http.StatusBadRequest, getValidationErrors(ac, &ve))
 	} else {
-		manageDefaultError(c, err)
+		manageDefaultError(ac.C, err)
 	}
 }
 
diff --git a/internal/api/validator.go b/internal/api/validator.go
index 6e8d8b0..a7d9522 100644
--- a/internal/api/validator.go
+++ b/internal/api/validator.go
@@ -3,6 +3,8 @@ package api
 import (
 	"fmt"
 
+	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
+	"git.artlef.fr/PersonalLibraryManager/internal/i18nresource"
 	"github.com/go-playground/validator/v10"
 )
 
@@ -11,27 +13,27 @@ type apiValidationError struct {
 	Err   string `json:"error"`
 }
 
-func getValidationErrors(ve *validator.ValidationErrors) []apiValidationError {
+func getValidationErrors(ac appcontext.AppContext, ve *validator.ValidationErrors) []apiValidationError {
 	errors := make([]apiValidationError, len(*ve))
 	for i, fe := range *ve {
 		errors[i] = apiValidationError{
 			Field: fe.Field(),
-			Err:   computeValidationMessage(&fe),
+			Err:   computeValidationMessage(ac, &fe),
 		}
 	}
 	return errors
 }
 
-func computeValidationMessage(fe *validator.FieldError) string {
+func computeValidationMessage(ac appcontext.AppContext, fe *validator.FieldError) string {
 	tag := (*fe).Tag()
 	switch tag {
 	case "required":
-		return fmt.Sprintf("%s is required.", (*fe).Field())
+		return i18nresource.GetTranslatedMessage(ac, "ValidationRequired")
 	case "min":
-		return fmt.Sprintf("%s is not long enough. It should be at least %s characters.", (*fe).Field(), (*fe).Param())
+		return fmt.Sprintf(i18nresource.GetTranslatedMessage(ac, "ValidationTooShort"), (*fe).Param())
 	case "max":
-		return fmt.Sprintf("%s is too long. It should be under %s characters.", (*fe).Field(), (*fe).Param())
+		return fmt.Sprintf(i18nresource.GetTranslatedMessage(ac, "ValidationTooLong"), (*fe).Param())
 	default:
-		return fmt.Sprintf("Validation failed for '%s' property.", tag)
+		return fmt.Sprintf(i18nresource.GetTranslatedMessage(ac, "ValidationPropertyFail"), tag)
 	}
 }
diff --git a/internal/appcontext/main.go b/internal/appcontext/main.go
new file mode 100644
index 0000000..bc68582
--- /dev/null
+++ b/internal/appcontext/main.go
@@ -0,0 +1,13 @@
+package appcontext
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"gorm.io/gorm"
+)
+
+type AppContext struct {
+	C    *gin.Context
+	Db   *gorm.DB
+	I18n *i18n.Bundle
+}
diff --git a/internal/i18nresource/locale.en.toml b/internal/i18nresource/locale.en.toml
new file mode 100644
index 0000000..5c31e52
--- /dev/null
+++ b/internal/i18nresource/locale.en.toml
@@ -0,0 +1,6 @@
+InvalidCredentials = "Invalid credentials."
+AuthenticationSuccess = "Authentication was a success."
+ValidationRequired = "This field is required."
+ValidationTooShort = "This field is too short. It should be at least %s characters."
+ValidationTooLong = "This field is too long. It should be under %s characters."
+ValidationPropertyFail = "Validation failed for '%s' property."
diff --git a/internal/i18nresource/locale.fr.toml b/internal/i18nresource/locale.fr.toml
new file mode 100644
index 0000000..77f392b
--- /dev/null
+++ b/internal/i18nresource/locale.fr.toml
@@ -0,0 +1,6 @@
+InvalidCredentials = "Identifiants invalides."
+AuthenticationSuccess = "Connexion réussie."
+ValidationRequired = "Ce champ est requis."
+ValidationTooShort = "Ce champ est trop court. Il devrait contenir au moins %s caractères."
+ValidationTooLong = "Ce champ est trop long. Il ne devrait pas dépasser %s caractères."
+ValidationPropertyFail = "La validation a échoué pour la propriété '%s'."
diff --git a/internal/i18nresource/main.go b/internal/i18nresource/main.go
new file mode 100644
index 0000000..4226659
--- /dev/null
+++ b/internal/i18nresource/main.go
@@ -0,0 +1,32 @@
+package i18nresource
+
+import (
+	"embed"
+
+	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"github.com/pelletier/go-toml"
+	"golang.org/x/text/language"
+)
+
+//go:embed locale.*.toml
+var localeFS embed.FS
+
+func InitializeI18n() *i18n.Bundle {
+	bundle := i18n.NewBundle(language.English)
+	bundle.RegisterUnmarshalFunc("toml", toml.Unmarshal)
+	bundle.LoadMessageFileFS(localeFS, "locale.en.toml")
+	bundle.LoadMessageFileFS(localeFS, "locale.fr.toml")
+	return bundle
+}
+
+func GetTranslatedMessage(ac appcontext.AppContext, messageID string) string {
+	localizer := i18n.NewLocalizer(ac.I18n, ac.C.GetHeader("Accept-Language"))
+	message, err := localizer.LocalizeMessage(&i18n.Message{
+		ID: messageID,
+	})
+	if err != nil {
+		message = err.Error()
+	}
+	return message
+}
diff --git a/internal/setup/setup.go b/internal/setup/setup.go
index 1a97d9f..0002551 100644
--- a/internal/setup/setup.go
+++ b/internal/setup/setup.go
@@ -5,8 +5,10 @@ import (
 	"github.com/gin-gonic/gin"
 
 	"git.artlef.fr/PersonalLibraryManager/internal/api"
+	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
 	"git.artlef.fr/PersonalLibraryManager/internal/config"
 	"git.artlef.fr/PersonalLibraryManager/internal/db"
+	i18nresource "git.artlef.fr/PersonalLibraryManager/internal/i18nresource"
 	"git.artlef.fr/PersonalLibraryManager/internal/jwtauth"
 	"git.artlef.fr/PersonalLibraryManager/internal/middleware"
 )
@@ -20,17 +22,18 @@ func Setup(config *config.Config) *gin.Engine {
 	r := gin.Default()
 	r.Use(cors.New(configureCors())) // All origins allowed by default
 	r.Use(middleware.Auth())
+	bundle := i18nresource.InitializeI18n()
 	r.GET("/mybooks", func(c *gin.Context) {
-		api.GetMyBooksHanderl(c, db)
+		api.GetMyBooksHanderl(appcontext.AppContext{C: c, Db: db, I18n: bundle})
 	})
 	r.POST("/book", func(c *gin.Context) {
-		api.PostBookHandler(c, db)
+		api.PostBookHandler(appcontext.AppContext{C: c, Db: db, I18n: bundle})
 	})
 	r.POST("/auth/signup", func(c *gin.Context) {
-		api.PostSignupHandler(c, db)
+		api.PostSignupHandler(appcontext.AppContext{C: c, Db: db, I18n: bundle})
 	})
 	r.POST("/auth/login", func(c *gin.Context) {
-		api.PostLoginHandler(c, db)
+		api.PostLoginHandler(appcontext.AppContext{C: c, Db: db, I18n: bundle})
 	})
 	return r
 }