Change Heading label to Track on AHRS UI.
</div>
<div class="col-xs-9">
<div class="row">
- <strong class="col-xs-3 text-center">Heading</strong>
+ <strong class="col-xs-3 text-center">Track</strong>
<strong class="col-xs-3 text-center">Pitch</strong>
<strong class="col-xs-3 text-center">Roll</strong>
<strong class="col-xs-3 text-center">P-Alt</strong>
