Show error message when trying to add duplicate exemptions ()

Fixes 

## How to test
1. Log in as admin
2. Go to "Admin / Match / Application periods"
3. Click "Edit exemptions" on the period
4. Add the same exemption twice to "Sture Student"

Reviewed-on: 
Reviewed-by: Nico Athanassiadis <nico@dsv.su.se>
Co-authored-by: Andreas Svanberg <andreass@dsv.su.se>
Co-committed-by: Andreas Svanberg <andreass@dsv.su.se>
This commit is contained in:
Andreas Svanberg 2025-02-20 13:56:13 +01:00 committed by Nico Athanassiadis
parent 9b26843570
commit a0fd84343c

@ -10,3 +10,4 @@ Type.NUMBER_OF_AUTHORS=Min/max author limitation
Type.SUBMIT_STUDENT_IDEA=Submit own idea outside open period
Type.SELECT_SUPERVISOR_IDEA=Select supervisor idea outside open period
type=Type to exempt
author.UniqueValidator=Exemption already exists, please remove the old one first