refactor: Remove the registerPerson GraphQL query

- The first profile is now created after the user email validation
- NavBar is correctly updated when a user is connected but without any profile
- Always fetch identities from the server at login (no cache)
- NoIdentitiesException is thrown again
- Refactor EditIdentity to create the first profile
- Translations updated
- Tests updated

Fixes #1762

src/i18n/ja.json

@@ -1152,7 +1152,7 @@
   "Your account has been successfully deleted": "あなたのアカウントの削除に成功しました",
   "Your account has been validated": "あなたのアカウントは認証されました",
   "Your account is being validated": "",
-  "Your account is nearly ready, {username}": "",
+  "Your account is nearly ready": "",
   "Your city or region and the radius will only be used to suggest you events nearby. The event radius will consider the administrative center of the area.": "",
   "Your current email is {email}. You use it to log in.": "現在のメールアドレスは{email}です。このアドレスを利用してログインしましょう",
   "Your email": "メールアドレス",