[MIG] account_financial_report: Finalize migration to 12.0

* Move back to CSS and FIX

  NameError: variable @odoo-view-background-color is undefined in - on line 99, column 23:
  98 .o_account_financial_reports_page {
  99     background-color: @odoo-view-background-color;
  100     color: @odoo-main-text-color;

* Porting: parent_left does not exist anymore. Using parent_path + account code to sort report lines

* FIX js error with date object not converted to string while clicking on initial balance amount
  See https://user-images.githubusercontent.com/1033131/58337566-5d525c80-7e46-11e9-913a-3c3e0115fb3e.gif

* IMP style and metadata

* FIX tests about new date format and partner_id computed field of account.move

* FIX errors like

  2019-06-03 16:11:51,406 17857 ERROR dev_12_account_financial_report odoo.sql_db: bad query: b"\nDELETE FROM 'report_vat_report_tax'\nWHERE COALESCE(\n    write_date, create_date, (now() at time zone 'UTC'))::timestamp\n    < ((now() at time zone 'UTC') - interval '3600.0 seconds')\n"
  ERROR: syntax error at or near "'report_vat_report_tax'"
  LINE 2: DELETE FROM 'report_vat_report_tax'
                    ^
* IMP translation template and IMP Italian translation

* Remove useless comments
* Use AsIs to avoid SQL injection
* Use fields.Date methods
* Remove useless data from tests
* Improve comments
* Fix wizard.multi.charts.accounts
* Move _get_partner_ids_domain to abstract wizard
* Refactor default partners in wizard to use recordsets
* Improve js style

account_financial_report/wizard/open_items_wizard.py

@@ -13,6 +13,7 @@ class OpenItemsReportWizard(models.TransientModel):
 
     _name = "open.items.report.wizard"
     _description = "Open Items Report Wizard"
+    _inherit = 'account_financial_report_abstract_wizard'
 
     company_id = fields.Many2one(
         comodel_name='res.company',
@@ -57,19 +58,6 @@ class OpenItemsReportWizard(models.TransientModel):
     def _default_foreign_currency(self):
         return self.env.user.has_group('base.group_multi_currency')
 
-    def _default_partners(self):
-        context = self.env.context
-
-        if context.get('active_ids') and context.get('active_model') \
-                == 'res.partner':
-            partner_ids = context['active_ids']
-            corp_partners = self.env['res.partner'].browse(partner_ids). \
-                filtered(lambda p: p.parent_id)
-
-            partner_ids = set(partner_ids) - set(corp_partners.ids)
-            partner_ids |= set(corp_partners.mapped('parent_id.id'))
-            return list(partner_ids)
-
     @api.onchange('company_id')
     def onchange_company_id(self):
         """Handle company change."""
@@ -90,11 +78,7 @@ class OpenItemsReportWizard(models.TransientModel):
         else:
             res['domain']['account_ids'] += [
                 ('company_id', '=', self.company_id.id)]
-            res['domain']['partner_ids'] += [
-                '&',
-                '|', ('company_id', '=', self.company_id.id),
-                ('company_id', '=', False),
-                ('parent_id', '=', False)]
+            res['domain']['partner_ids'] += self._get_partner_ids_domain()
         return res
 
     @api.onchange('receivable_accounts_only', 'payable_accounts_only')