Make only tsunami data available to the frontend

Requirements :

The frontend gets only data of tsunamis. (The database has other natural disaster data)

User story :

As a tsunami researcher I want more specific data about tsunamis so that I can study the tsunamis on each country

Acceptance Criteria :

• Frontends gets only tsunami data
• Has and passes tests
• Implement UML-diagram
• Documentation

Commits:

Assignee:

@yahyam @sinner