message: csv export: fix button style
diff: </div>
  </div>
  </div>
  -
  - <div class="uk-width-1-1 narrow-div">
  - <button *ngIf="!exportingCsv" class="uk-button uk-button-primary uk-width-1-1" type="button" [disabled]="!settings.settings.serverAPI" (click)="exportToCsv()">{{settings.settings.serverAPI ? 'EXPORT HISTORY':'NOT AVAILABLE IN OFFLINE MODE'}}</button>
  - <button *ngIf="exportingCsv" class="uk-button uk-button-primary uk-disabled uk-width-1-1" type="button"><span class="uk-margin-right" uk-spinner></span> FETCHING HISTORY...</button>
  </div>
  </div>
  +
  + <div class="uk-card-footer uk-text-right@s uk-text-center nlt-button-group">
  + <button *ngIf="!exportingCsv" class="uk-button uk-button-primary uk-width-1-1@s uk-width-auto@m uk-float-right" type="button" [disabled]="!settings.settings.serverAPI" (click)="exportToCsv()">{{settings.settings.serverAPI ? 'EXPORT HISTORY':'NOT AVAILABLE IN OFFLINE MODE'}}</button>
  + <button *ngIf="exportingCsv" class="uk-button uk-button-secondary uk-disabled uk-width-1-1@s uk-width-auto@m uk-float-right nlt-icon-button nlt-icon-button-inline" type="button"><span class="uk-margin-right" uk-spinner="ratio: 0.5;"></span> FETCHING HISTORY...</button>
  </div>
  </div>
  