Rewrite README + use lettre crate to validate email address instead of regex

TODO.md

@@ -1,14 +1,22 @@
+* FIX: when the event blur is triggered when changing page, the async process doesn't finish all the time
 * Check position of message error in profile/sign in/sign up with flex grid layout
 * Define the UI (mockups).
     * Two CSS: one for desktop and one for mobile
     * Use CSS flex/grid to define a good design/layout
-* Drag and drop of steps and groups to define their order
+* CSS for toast and modal dialog
 * Make a search page
+    Use FTS5:
+        https://sqlite.org/fts5.html
+        https://www.sqlitetutorial.net/sqlite-full-text-search/
 * Use of markdown for some field (how to add markdown as rinja filter?)
 * Quick search left panel by tags ?
 * Make the home page: Define what to display to the user
 * Show existing tags when editing a recipe
 
+[ok] Drag and drop of steps and groups to define their order
+[ok] Force tags in lowercase
+[ok] Remove the given language to recipe_edit and replace it by tr (like the header)
+    [ok] List only recipe of current language
 [ok] Add support to translations.
     * Make a Text database (a bit like d-lan.net) and think about translation.
     * The language is stored in cookie or in user profile if the user is connected