fix(dashboard): address PR feedback on enroll load and copy

Remove unnecessary getApiKeyHeaders from public course-by-slug fetch.
Shorten enrolled_verify_email copy, fix ru.json duplicate keys, and
translate enroll verification strings in non-English locales.

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

apps/dashboard/src/routes/(org-site)/course/[slug]/enroll/+page.server.ts

@@ -56,12 +56,9 @@ export const load = async ({ params, url }) => {
   }
 
   const courseResult = await safeServerApi<GetCourseBySlugSuccess>(() =>
-    classroomio.course.slug[':slug'].$get(
-      {
-        param: { slug }
-      },
-      getApiKeyHeaders()
-    )
+    classroomio.course.slug[':slug'].$get({
+      param: { slug }
+    })
   );
 
   if (!courseResult.ok || !courseResult.body.data) {