Shorten tab titles of longterm statistics charts

4 jobs for master in 10 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #99327
test

00:03:23

 
  Build
passed #99328
backend

00:06:56

passed #99329
frontend

00:03:29

passed #99330
stats

00:00:49