Add help system and initial help file

src/app/components/ModalHelp.jsx

@@ -0,0 +1,47 @@
+import React from 'react';
+import { findDOMNode } from 'react-dom';
+import TranslatedComponent from './TranslatedComponent';
+
+/**
+ * Help Modal
+ */
+export default class ModalHelp extends TranslatedComponent {
+
+  static propTypes = {
+    title: React.PropTypes.string
+  };
+
+  /**
+   * Constructor
+   * @param  {Object} props   React Component properties
+   */
+  constructor(props) {
+    super(props);
+  }
+
+  /**
+   * Focus on textarea and select all
+   */
+  componentDidMount() {
+    const e = findDOMNode(this.refs.exportField);
+    if (e) {
+      e.focus();
+      e.select();
+    }
+  }
+
+  /**
+   * Render the modal
+   * @return {React.Component} Modal Content
+   */
+  render() {
+    const translate = this.context.language.translate;
+    const text = translate('HELP_TEXT');
+
+    return <div className='modal' onClick={ (e) => e.stopPropagation() }>
+      <h2>{translate(this.props.title || 'Help')}</h2>
+      <div dangerouslySetInnerHTML={{__html: text}} />
+      <button className='r dismiss cap' onClick={this.context.hideModal}>{translate('close')}</button>
+    </div>;
+  }
+}