Semantic update

app/templates/components/components/back-link/template.njk

@@ -1,4 +1,4 @@
-<nav class="usa-breadcrumb" aria-label="Back button">
-  <a href="{%- if params.href %}{{ params.href }}{% else %}#{% endif -%}" class="usa-link usa-back-link display-inline-flex {%- if params.classes %} {{ params.classes }}{% endif -%}"
-  {%- for attribute, value in params.attributes %} {{attribute}}="{{value}}"{% endfor %}>{{ (params.html | safe if params.html else (params.text if params.text else 'Back')) }}</a>
+<nav class="usa-breadcrumb" aria-label="Breadcrumb">
+  <a href="{{ params.href or '#' }}" class="usa-link usa-back-link display-inline-flex {{ params.classes or '' }}"
+  {%- for attribute, value in params.attributes %} {{ attribute }}="{{ value }}" {% endfor %}>{{ params.html | safe or params.text or 'Back' }}</a>
 </nav>