fix: [UI] With the correct field name, it works better ;-)
fix: [UI] With the correct field name, it works better ;-)

- threat_level_id is the name of the field, and
  now the hover description works :D

MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,FIRSTdotorg/MISP,MISP/MISP,SteveClement/MISP,FIRSTdotorg/MISP,FIRSTdotorg/MISP,MISP/MISP,FIRSTdotorg/MISP