Améliore UI gestion des UE antérieures

app/api/jury.py

app/models/validations.py

app/scodoc/sco_bulletins.py

app/scodoc/sco_cursus_dut.py

app/scodoc/sco_edit_ue.py

app/scodoc/sco_formsemestre_exterieurs.py

app/scodoc/sco_formsemestre_validation.py

app/static/css/jury_delete_manual.css

app/static/css/scodoc.css

app/static/js/validate_previous_ue.js

app/templates/jury/jury_delete_manual.j2

app/views/notes.py