[IMP] l10n_lu: various improvements

- fixed typos in account names and it's translation for German and French
- set default stock input/output valuation accounts for product categories
- corrected default expense account
- added two reconcile models: Bank Fees, Cash Discount
- fixed typos in account tax report and improved sequence(will show first base amounts then tax amounts)
- deactivated few taxes and improved few tax labels
- correctly translated account names in German and French according to official PCN2020 document

closes odoo/odoo#36963

Task: 1917932
Signed-off-by: Josse Colpaert <jco@openerp.com>