{{#unless not-goback}}
<button class="btn btn-prev" {{action (if on-goback on-goback 'goback')}}>
    <i class="ace-icon fa fa-arrow-left"></i>
    Goback
</button>
{{/unless}}

{{#unless no-submit}}
<button class="btn btn-success btn-next" {{action (if on-submit on-submit 'save')}}>
    Submit
    <i class="ace-icon fa fa-arrow-right icon-on-right"></i>
</button>
{{/unless}}