title: React material-table is not displaying table icons
body: <p>I have a project where I have to use a table. I am using material-table. But I can't seem to get it to look right. The icons that are needed for the table are not showing and instead I get some placeholder texts.</p>
  <p>Here is the code I am using to show the table. I have material-table and material-icons installed in the project.</p>
  <pre><code>class RegistrationList extends Component {
    state = {
      registrations: [],
    };
  
    infoButtonHandler(id) {}
  
    componentDidMount() {
      axios.get(&quot;http://localhost:3030/api/items&quot;).then((res) =&gt; {
        let registrations = [];
        res.data.forEach((registration) =&gt; {
          let childeren = &quot;&quot;;
          for (let i = 0; i &lt; registration.childeren.length; i++) {
            childeren += registration.childeren[i].name;
            if (i + 1 !== registration.childeren.length) {
              childeren += &quot;, &quot;;
            }
          }
          registrations.push({
            _id: registration._id,
            name: registration.name,
            childeren: childeren,
            street: registration.street,
            houseNumber: registration.houseNumber,
            city: registration.city,
            postalCode: registration.postalCode,
          });
        });
        this.setState({ registrations: registrations });
      });
    }
  
    rowClickedHandler(rowData) {
      this.props.history.push(&quot;/RegistrationDetail/&quot; + rowData._id);
    }
  
    render() {
      let table = (
        &lt;MaterialTable
          title=&quot;Overzicht&quot;
          columns={[
            { title: &quot;familienaam&quot;, field: &quot;name&quot; },
            { title: &quot;kinderen&quot;, field: &quot;childeren&quot; },
            { title: &quot;dorp&quot;, field: &quot;city&quot; },
            { title: &quot;postcode&quot;, field: &quot;postalCode&quot; },
            { title: &quot;straat&quot;, field: &quot;street&quot; },
            { title: &quot;nr.&quot;, field: &quot;houseNumber&quot; },
          ]}
          data={this.state.registrations}
          options={{
            search: true,
          }}
          onRowClick={(event, rowData) =&gt; this.rowClickedHandler(rowData)}
        /&gt;
      );
      return &lt;div&gt;{table}&lt;/div&gt;;
    }
  }
  </code></pre>
  <p><a href="https://i.stack.imgur.com/KOq90.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KOq90.png" alt="enter image description here" /></a></p>