en.json

{
  "menu.item": "Menu Item",
  "menu.item1": "Menu Item 1"
}

ExampleComponent.js

import React from 'react';
import { defineMessages } from 'react-intl';
import FormattedAnchor from './FormattedAnchor';

const messages = defineMessages({
    menuItem: {
        id: 'menu.item',
        defaultMessage: 'Menu Item',
    },
    menuItem1: {
        id: 'menu.item1',
        defaultMessage: 'Menu Item 1',
    },
});

class ExampleComponent extends React.Component {
  render() {
    return (
      <div>
        <FormattedAnchor msg={messages.menuItem} />
        <FormattedAnchor href="some_page.html" msg={messages.menuItem1} target="_blank" />
      </div>
    );
  }
}

export default ExampleComponent;

FormattedAnchor.js

import React from 'react';
import { injectIntl } from 'react-intl';

const FormattedAnchor = (props) => {
  const { formattedMessage } = this.props.intl;
  return (
    <a
      title={formattedMessage(props.msg)}
      {...props}
    />
  );
};

export default injectIntl(FormattedAnchor);

fr.json

{
  "menu.item": "Item du Menu",
  "menu.item1": "Item du Menu 1"
}

gistfile1.txt

import React, { PropTypes } from 'react';
import ExampleComponent from './ExampleComponent';
import { addLocaleData, IntlProvider } from 'react-intl';

import enMessages from './en.json';
import enLocaleData from 'react-intl/locale-data/en';
addLocaleData(enLocaleData);

import frMessages from './fr.json';
import frLocaleData from 'react-intl/locale-data/fr';
addLocaleData(frLocaleData);

export class App extends React.Component {
  render() {
    return (
      <IntlProvider locale="en" messages={enMessages}>
        <ExampleComponent />  
      </IntlProvider>
    );
  }
}

export default App;