Hii @kartik,
You can wrap the disabled button and put the tooltip on the wrapper:
<div class="tooltip-wrapper" data-title="Dieser Link führt zu Google">
<button class="btn btn-default" disabled>button disabled</button>
</div>
If the wrapper has display:inline then the tooltip doesn't seem to work.
Using display:block and display:inline-block seem to work fine. It also appears to work fine with a floated wrapper.
Thank You!!