feat: multi language support (#254)

* feat: multitranslational support

* - completion of settings page
- completion of sidebar

* sidebar rerendering bug fix

* completion of the lesson navigation & materials page

* completion of the course navigation

* completion of requested languages

* - Implementation of Language Picker
- Rename Bug Fixes

* checkpoint save

* - addition of the language picker to the onboarding.
- addition of the language switcher for the lesson notes.

* merge completion

* initialization of the new branch

* add transition.svelte file

* lesson note bug fix

* feat: add translation migration

* completion of translation

* fix height issue of dropdown

* refactoring

* fix: improve code with LOCALE from db

* finally get it fully functional

* connect with AI

* backward compatibility for lesson note

* preserve old content, when generating AI content

* undo translations in upgrade modal

* fix duplicate key issue from codacy trigger

---------

Co-authored-by: Rotimi Best <best@classroomio.com>

apps/dashboard/src/routes/courses/[id]/settings/+page.svelte

@@ -3,12 +3,13 @@
   import PageNav from '$lib/components/PageNav/index.svelte';
   import PageBody from '$lib/components/PageBody/index.svelte';
   import Settings from '$lib/components/Course/components/Settings/index.svelte';
+  import { t } from '../../../../lib/utils/functions/translations';
 
   export let data;
 </script>
 
 <CourseContainer bind:courseId={data.courseId}>
-  <PageNav title="Settings" />
+  <PageNav title={$t('course.navItem.settings.heading')} />
   <PageBody>
     <Settings />
   </PageBody>