[FIX] account: term is not translatable

The bills upload widget uses a custom attr "linkText". translate.py will only generate terms that are in the TRANSLATED_ATTRS constant, thereby not including these in the po template file.

To fix this, the attribute is changed to a recognised attr "title".
The JS widget will still recognize linkText, for databases that have not updated the module.

Task-3335585

closes odoo/odoo#125276

Related: odoo/enterprise#42651
Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com>