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/package.json

@@ -54,6 +54,7 @@
     "stripe": "^14.22.0",
     "svelte-email": "^0.0.4",
     "svelte-ui": "workspace:*",
+    "sveltekit-i18n": "^2.4.2",
     "unsplash-js": "^7.0.18",
     "wait-on": "^7.0.1",
     "zod": "^3.21.4"