Improve flows for social auth users (#13862)

* Multiple fixes for social authentication flows

* frontend changes

* add missing computed property

* Improvements to social flows

* fix existing email error

* minor fixes

* fix space

* fix test

* fix lint

Co-authored-by: SabreCat <sabe@habitica.com>

website/client/src/components/settings/deleteModal.vue

@@ -7,9 +7,9 @@
   >
     <div class="modal-body">
       <br>
-      <strong v-if="user.auth.local.email">{{ $t('deleteLocalAccountText') }}</strong>
+      <strong v-if="user.auth.local.has_password">{{ $t('deleteLocalAccountText') }}</strong>
       <strong
-        v-if="!user.auth.local.email"
+        v-if="!user.auth.local.has_password"
       >{{ $t('deleteSocialAccountText', {magicWord: 'DELETE'}) }}</strong>
       <div class="row mt-3">
         <div class="col-6">