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 <[email protected]>

apps/dashboard/src/lib/components/PageNav/index.svelte

@@ -2,6 +2,7 @@
   import NewButton from '../PrimaryContainedButton/index.svelte';
   import TextField from '../Form/TextField.svelte';
   import Chip from '../Chip/index.svelte';
+  import { t } from '$lib/utils/functions/translations';
 
   export let title = '';
   export let overidableStyle = '';
@@ -43,7 +44,7 @@
         {:else}
           <TextField
             bind:value={title}
-            placeholder="Course title"
+            placeholder={$t('course.navItem.settings.course_title')}
             onChange={() => {
               enterEditTitleMode = false;