JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="myApp" ng-controller="myCtrl">
  <textarea type="email" placeholder="{{!lectura ? placeholder : ''}}" ng-focus="setPlaceholder()" ng-blur="!lectura ? setPlaceholder('TRANSLATION_KEY'):''" required ng-readonly="{{lectura}}"></textarea>
</div>

JavaScript

angular.module('myApp', [])
  .controller('myCtrl', function($scope, $filter) {
    $scope.placeholder = $filter('translate')('TRANSLATION_KEY');
    $scope.lectura = false;
    $scope.setPlaceholder = function(data) {
      $scope.placeholder = $filter('translate')(data);
    };
  })
  .filter('translate', function() {
    return function(data) {
      return data;
    };
  });