Boostrap 3

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/4.0.1/css/font-awesome.min.css">
<div class="container">
    <div class="row">
        <div class="col-xs-2">
            <button class="btn" style="color: #660066;"> <i class="fa fa-arrow-left" data-ng-click="onClickBack()"></i>

            </button>
        </div><!-- 
     --><div class="col-xs-10">
             <h4>Some really large label that will wrap to multiple lines in small screens</h4>

        </div>
    </div>
</div>

CSS

.col-xs-2, .col-xs-10 {
    display: inline-block;
    float: none;
}
.col-xs-10 {
    vertical-align: middle;
}