message: Username is one word
diff: @@ -305,7 +305,7 @@ module.exports = React.createClass({
  <input className="mx_Login_submit" type="submit" value={_t("Register")} />
  );
  - const placeholderUserName = _t("User name");
  + const placeholderUsername = _t("Username");
  return (
  <div>
  @@ -313,7 +313,7 @@ module.exports = React.createClass({
  { emailSection }
  { phoneSection }
  <input type="text" ref="username"
  - placeholder={placeholderUserName} defaultValue={this.props.defaultUsername}
  + placeholder={placeholderUsername} defaultValue={this.props.defaultUsername}
  className={this._classForField(FIELD_USERNAME, 'mx_Login_field')}
  onBlur={function() {self.validateField(FIELD_USERNAME);}} />
  <br />
  