packages/fxa-content-server/app/scripts/templates/partial/settings-header.mustache

{{#displayName}}
  <h1 class="card-header">{{displayName}}</h1>
  <h2 class="card-subheader">{{email}}</h2>
{{/displayName}}
{{^displayName}}
  <h1 class="card-header">{{email}}</h1>
  <h2 class="card-subheader"></h2>
{{/displayName}}