Catalog Item form buttons appear properly on the 5.7.z. Could you verify it?
Fixed in 126.96.36.199.20170321181409_349f1b1
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.