Input Validation Improvements - Managing Ranks

In general input validation should take place whenever a input field loses its focus or when the save button is pressed. This would mean that save button should not be disabled anymore.

Next are the concrete requirements for the create/edit ranks:

1. A message should be shown what went wrong when user for instance tries to create a rank with the existing name or a number with negative value.
2. The rank name shouldn't be empty. This works fine, but it also implies that rank with the name which consists of spaces is also valid.