<template name="editActivityButton">
  <button type="button" class="btn btn-warning pull-right">Edit</button>
</template>

<template name="editActivityButton">
  <button type="button" class="btn btn-default pull-right">
    <i class="fa fa-pencil" aria-hidden="true"></i>&nbsp;
    {{_ "editActivityButton-text" }}
  </button>
</template>

Add font awesome pencil icon
Add font awesome pencil icon
