add i18n

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>