Modal confirm action

• https://projects.dev.finki.ukim.mk/scientific-project-programmes on delete
• https://projects.dev.finki.ukim.mk/grant-holders on delete
• https://projects.dev.finki.ukim.mk/calls on delete

On these pages when a user clicks on the delete button, a confirmation modal should be shown like it is shown on https://projects.dev.finki.ukim.mk/scientific-projects this page. Also there is an error when a user tries to delete a project call, fix that.