Useless upercase in CSV help text

There is no need to use uppercase for invoice.

assigned to @ced

added accounting type::behavior + 1 deleted label

added 1 deleted label and removed 1 deleted label

New review356441002 at https://codereview.tryton.org/356441002/#ps382541002

New changeset 0e3b8e5b5203 by Cédric Krier in branch 'default':
Remove uppercase to invoice in help text
https://hg.tryton.org/modules/account_es_sii/rev/0e3b8e5b5203

added 1 deleted label and removed 1 deleted label

closed

New changeset 188876fa28d4 by Cédric Krier in branch 'default':
Remove uppercase to invoice in help text
https://hg.tryton.org/tryton-env/rev/188876fa28d4