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Sebastian With this I get the error: TypeError: Cannot read property 'language' of undefined after 1 second. this.props.language is working in the constructor. But not in timer. Idk what's wrong. Let's see what you get in 2h+/-. ;)

export default class About extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      arr: this.props.language.about.style[0]
    };
    this.timer = this.timer.bind(this);
  }

  timer() {
    let i = 0;
    setInterval( function() {
      this.setState({
        arr: this.props.language.about.style[i]
      });
      i++;
      if (i === this.props.language.about.style.length) {
        i = 0;
      }
    }, 1000);
  }

  componentDidMount() {
    this.timer();
  }

  render() {
    return (
      <div>{this.state.arr}</div>
    );
  }
}