message: Change Riot Bot button text and make it a block element
  Fixes
diff: @@ -140,10 +140,12 @@ export default class HelpSettingsTab extends React.Component {
  target='_blank'>{sub}</a>,
  })
  }
  + <div>
  <AccessibleButton onClick={this._onStartBotChat} kind='primary'>
  - {_t("Start a chat with Riot Bot")}
  + {_t("Chat with Riot Bot")}
  </AccessibleButton>
  </div>
  + </div>
  );
  }
  