Merge branch '1850-update-msg-ba' into 'dev_cooperatic'

1850 add explanation for "rattrapage"

See merge request !88
2 jobs from dev_cooperatic in 1 minute 33 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #2439
lint:js

00:24

passed #2440
unit:django

01:09