[FIX] account: display name of journal entries

1- create a group payment (10 ~ 15 invoices);
2- Open the created journal entry.

The first issue we see is that the breadcrumb is too big to the size of
the screen.

3- Open the 'Reconciled Entries'.

Before this commit, the screen was completely shifted and not visible.
This occurs also because the breadcrumb is too big.

Now, the references added to the name of the entry is limited to 50
characters.

opw-2166551

closes odoo/odoo#43614

Signed-off-by: Simon Goffin (sig) <sig@openerp.com>