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>

supabase/migrations/20240323154037_translation.sql

@@ -0,0 +1,13 @@
+create type "public"."LOCALE" as enum ('en', 'hi', 'fr', 'pt', 'de', 'vi', 'ru', 'es');
+
+create table
+  public.lesson_language (
+    id bigint generated by default as identity,
+    content text null,
+    lesson_id uuid null default gen_random_uuid (),
+    locale "LOCALE" default 'en'::"LOCALE",
+    constraint lesson_language_pkey primary key (id),
+    constraint public_lesson_language_lesson_id_fkey foreign key (lesson_id) references lesson (id)
+  ) tablespace pg_default;
+
+alter table "public"."profile" add column "locale" "LOCALE" default 'en'::"LOCALE";