CCM-8601: fix template type mapping on the manage templates page

Author: alexnuttall

frontend/src/__tests__/components/molecules/__snapshots__/ManageTemplates.test.tsx.snap

@@ -269,7 +269,7 @@ exports[`ManageTemplates component matches snapshot with not submitted status 1`
               >
                 Type 
               </span>
-              Letter
+              Letter - French
             </td>
             <td
               class="nhsuk-table__cell"
@@ -580,7 +580,7 @@ exports[`ManageTemplates component matches snapshot with submitted status 1`] =
               >
                 Type 
               </span>
-              Letter
+              Letter - French
             </td>
             <td
               class="nhsuk-table__cell"

frontend/src/components/molecules/ManageTemplates/ManageTemplates.tsx

@@ -7,6 +7,7 @@ import content from '@content/content';
 import { format } from 'date-fns';
 import Link from 'next/link';
 import {
+  letterTypeDisplayMappings,
   previewTemplatePages,
   TemplateStatus,
   templateStatusToDisplayMappings,
@@ -25,6 +26,15 @@ const generateViewTemplateLink = (template: TemplateDTO): string => {
   return `/${previewTemplatePages(template.templateType)}/${template.id}`;
 };
 
+const typeDisplayMappings = (template: TemplateDTO) =>
+  template.templateType === TemplateType.LETTER &&
+  'letterType' in template &&
+  template.letterType &&
+  'language' in template &&
+  template.language
+    ? letterTypeDisplayMappings(template.letterType, template.language)
+    : templateTypeDisplayMappings(template.templateType);
+
 export function ManageTemplates({
   templateList,
 }: {
@@ -66,9 +76,7 @@ export function ManageTemplates({
                     {template.name}
                   </Link>
                 </Table.Cell>
-                <Table.Cell>
-                  {templateTypeDisplayMappings(template.templateType)}
-                </Table.Cell>
+                <Table.Cell>{typeDisplayMappings(template)}</Table.Cell>
                 <Table.Cell>
                   <Tag
                     color={