added i18n, english and french for now

src/components/MessageInput.vue

@@ -1,3 +1,8 @@
+<template>
+  <textarea ref="textareaRef" v-model="content" @input="resize" @keydown="handleKeydown" rows="1"
+    :placeholder="$t('chat-input-placeholder')"></textarea>
+</template>
+
 <script setup lang="ts">
 import { ref, nextTick } from 'vue'
 
@@ -46,11 +51,6 @@ function handleKeydown(e: KeyboardEvent) {
 }
 </script>
 
-<template>
-  <textarea ref="textareaRef" v-model="content" @input="resize" @keydown="handleKeydown" placeholder="type a message"
-    rows="1"></textarea>
-</template>
-
 <style scoped>
 textarea {
   width: 100%;