title: The text of button at react native is always uppercase
body: <p>I created a component at react-native, but the text of the button is always at uppercase, someone knows why it doesn't take the text that pass, because I want to show 'Login', but it shows 'LOGIN'</p>
  
  <pre class="lang-js prettyprint-override"><code>import React, { Component } from 'react';
  import { View, Button} from 'react-native';
  import LabelApp from "../../config/labels.app";
  
  const labelApp = LabelApp.loginView;
  
  export default class Login extends Component {
  
    constructor(props){
      super(props);
      this.handleClickBtnEnter = this.makeLogin.bind(this);
    }
  
    makeLogin() {
  
    }
  
    render() {
      return (
       &lt;View&gt;
         &lt;Button title= {labelApp.textButtonLogin} onPress={this.handleClickBtnEnter}/&gt;
       &lt;/View&gt;
      );
    }
  }
  </code></pre>
  
  <p>Label of component</p>
  
  <pre class="lang-js prettyprint-override"><code>const LabelApp = {
      loginView: {
          textButtonLogin: 'Ingresar',
      },
  }
  export default LabelApp;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/DiVzG.png" rel="noreferrer">The visualization</a></p>