Suspicious line to output ViewHelper content

[schams-net]

The following line in Mittwald\Typo3Forum\ViewHelpers\Post\HelpfulButtonViewHelper, method render() looks suspicious:

$btn = '<div data-toogle="tooltip" title="' . $title . '" data- class="' . $class . '" data-countusertarget="' . $countUserTarget . '" data-counttarget="' . $countTarget . '" data-post="' . $post->getUid() . '" data-pageuid="' . $this->settings['pids']['Forum'] . '" data-eid="' . $this->settings['forum']['post']['helpfulBtn']['eID'] . '"></div>';

• I don't know which JS library is used, but is data-toogle correct?
  Maybe it should read data-toggle?
• The space between data- and class also looks suspicious.

[DavidBruchmann]

I never found any usage of data-class but in Public/Javascript/forum.js some data attributes are used.
The whole JS seems being outdated especially as jquery 1.10 is still used.
I think there might be some mess too perhaps, so someone spending some time on it and removing unused things too is welcome ;-)
One question is if we leave functionality or if there shall be something added i.e. modal-windows, but the best would be anyway having a simple basic theme and for additional features further theme(s).