«Volontiers, mais c'est quand même regrettable qu'un restaurant puisse être négligent à ce point !» This phrase is in the lesson text as quoted here. In the Activity - Write It section it is clearly misspoken as «Volontiers, mais c'est quand même regrettable qu'un restaurant puisse être négligABLE à ce point !», although still transcribed and assessed as if the correct phrase from the lesson has been presented.  My wife is French, and has confirmed what I am hearing, and that the phrase is incorrect as presented in the activity.
 

Salut MCK,

Thank you very much for your feedback. I have had a listen to the phrase and you're right, it was mis-recorded as négligeable rather than as négligent. Our apologies for this error! I have passed this on to our French team to see about getting this fixed.

À la prochaine,

Liss