message: Accentuate OAuth login message
diff: -<div fxLayoutAlign="center">
  - <div class="oauth">
  +<mat-card fxLayoutAlign="center" class="important-box">
  + <div>
  <h3>{{"TITLE_LOGIN" | translate}}</h3>
  <div>{{"CONFIRM_LOGGED_IN_VIA_OAUTH2" | translate}}</div>
  </div>
  -</div>
  +</mat-card>
  