style: unify info/warn/error alerts
Created by: HejdaJakub
- Design of our ui alerts was unified.
- Fixed wrong usage of info/warn/error alerts in some html files.
- Fixed alert text in publication-systems-list.
- Unified definition of alert type in html files - we mainly use definition alert_type="string", but in some files was definition [alert_type]="'string'" - it was unified to definition alert_type="string".