perf[login]: i18n of input placeholder #844

src/views/login/index.vue

 <template>
   <div class="login-container">
+
     <el-form class="login-form" autoComplete="on" :model="loginForm" :rules="loginRules" ref="loginForm" label-position="left">
+
       <div class="title-container">
         <h3 class="title">{{$t('login.title')}}</h3>
         <lang-select class="set-language"></lang-select>
       </div>
+
       <el-form-item prop="username">
         <span class="svg-container svg-container_login">
           <svg-icon icon-class="user" />
         </span>
-        <el-input name="username" type="text" v-model="loginForm.username" autoComplete="on" placeholder="username" />
+        <el-input name="username" type="text" v-model="loginForm.username" autoComplete="on" :placeholder="$t('login.username')"
+        />
       </el-form-item>
 
       <el-form-item prop="password">
         <span class="svg-container">
           <svg-icon icon-class="password" />
         </span>
-        <el-input name="password" :type="passwordType" @keyup.enter.native="handleLogin" v-model="loginForm.password" autoComplete="on" placeholder="password" />
+        <el-input name="password" :type="passwordType" @keyup.enter.native="handleLogin" v-model="loginForm.password" autoComplete="on"
+          :placeholder="$t('login.password')" />
         <span class="show-pwd" @click="showPwd">
           <svg-icon icon-class="eye" />
         </span>