frappe-lms/lms/templates/emails/assignment_submission.html

<p>
    {{ _("{0} has submitted the assignment {1}").format(frappe.bold(member_name), frappe.bold(assignment_title)) }}
</p>
<br>
<p> {{ _(" Please evaluate and grade it.") }} </p>
<br>`
<a href="{{ get_lms_route('assignment-submission/' ~ assignment_name ~ '/' ~ submission_name) }}">
    {{ _("Open Assignment") }}
</a>