[IMP] account, base_import: improve accounting import

- Remove FEC from res.config.settings - everything is now linked in the import guide (in enterprise)
- Compute debit and credit from opening_balance
- Update import templates for account.account, account.move, res.partner
- Small UI changes in base_import: add an action title and improve the template button design

task-2888243

closes odoo/odoo#96291

Related: odoo/enterprise#29627
Related: odoo/upgrade#3794
Signed-off-by: Cedric Snauwaert <csn@odoo.com>

addons/base_import/static/src/legacy/js/import_action.js

@@ -135,7 +135,7 @@ var DataImport = AbstractAction.extend({
         // import object id
         this.id = null;
         this.session = session;
-        this._title = _t('Import a File'); // Displayed in the breadcrumbs
+        this._title = action.name || _t('Import a File'); // Displayed in the breadcrumbs
         this.do_not_change_match = false;
         this.sheets = [];
         this.selectionFields = {};  // Used to compute fallback values in backend.

addons/base_import/static/src/legacy/xml/base_import.xml

@@ -20,7 +20,7 @@
                     </p>
                     <div class="mt16 mb4">Need Help?</div>
                     <div t-foreach="widget.importTemplates" t-as="template">
-                        <a t-att-href="template.template" aria-label="Download" title="Download">
+                        <a class="btn btn-outline-primary mb32 mt8" t-att-href="template.template" aria-label="Download" title="Download">
                             <i class="fa fa-download"/> <span><t t-esc="template.label"/></span>
                         </a>
                     </div>