diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 74db9f3435f..7b34ed360d5 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -445,7 +445,7 @@ class AccountInvoice(models.Model):
     @api.onchange('invoice_line_ids')
     def _onchange_invoice_line_ids(self):
         taxes_grouped = self.get_taxes_values()
-        tax_lines = self.tax_line_ids.browse([])
+        tax_lines = self.tax_line_ids.filtered('manual')
         for tax in taxes_grouped.values():
             tax_lines += tax_lines.new(tax)
         self.tax_line_ids = tax_lines
diff --git a/addons/l10n_fr_certification/models/account.py b/addons/l10n_fr_certification/models/account.py
index ecb0f5aff8b..bef0880d7ca 100644
--- a/addons/l10n_fr_certification/models/account.py
+++ b/addons/l10n_fr_certification/models/account.py
@@ -102,7 +102,7 @@ class AccountMove(models.Model):
         """
         moves = self.search([('state', '=', 'posted'),
                              ('company_id', '=', company_id),
-                             ('l10n_fr_secure_sequence_number', '!=', False)],
+                             ('l10n_fr_secure_sequence_number', '!=', 0)],
                             order="l10n_fr_secure_sequence_number ASC")
 
         if not moves:
diff --git a/addons/point_of_sale/models/pos_order.py b/addons/point_of_sale/models/pos_order.py
index 752a0d51ef6..aea768357a0 100644
--- a/addons/point_of_sale/models/pos_order.py
+++ b/addons/point_of_sale/models/pos_order.py
@@ -757,21 +757,14 @@ class PosOrderLine(models.Model):
     @api.depends('price_unit', 'tax_ids', 'qty', 'discount', 'product_id')
     def _compute_amount_line_all(self):
         for line in self:
-            currency = line.order_id.pricelist_id.currency_id
-            taxes = line.tax_ids.filtered(lambda tax: tax.company_id.id == line.order_id.company_id.id)
-            fiscal_position_id = line.order_id.fiscal_position_id
-            if fiscal_position_id:
-                taxes = fiscal_position_id.map_tax(taxes)
-            price = self.env['account.tax']._fix_tax_included_price(
-                line.price_unit * (1 - (line.discount or 0.0) / 100.0), line.product_id.taxes_id, taxes)
-            line.price_subtotal = line.price_subtotal_incl = price * line.qty
-            if taxes:
-                taxes = taxes.compute_all(price, currency, line.qty, product=line.product_id, partner=line.order_id.partner_id or False)
-                line.price_subtotal = taxes['total_excluded']
-                line.price_subtotal_incl = taxes['total_included']
-
-            line.price_subtotal = currency.round(line.price_subtotal)
-            line.price_subtotal_incl = currency.round(line.price_subtotal_incl)
+            fpos = line.order_id.fiscal_position_id
+            tax_ids_after_fiscal_position = fpos.map_tax(line.tax_ids) if fpos else line.tax_ids
+            price = line.price_unit * (1 - (line.discount or 0.0) / 100.0)
+            taxes = tax_ids_after_fiscal_position.compute_all(price, line.order_id.pricelist_id.currency_id, line.qty, product=line.product_id, partner=line.order_id.partner_id)
+            line.update({
+                'price_subtotal_incl': taxes['total_included'],
+                'price_subtotal': taxes['total_excluded'],
+            })
 
     @api.onchange('product_id')
     def _onchange_product_id(self):
@@ -783,8 +776,10 @@ class PosOrderLine(models.Model):
             price = self.order_id.pricelist_id.price_get(
                 self.product_id.id, self.qty or 1.0, self.order_id.partner_id.id)[self.order_id.pricelist_id.id]
             self._onchange_qty()
-            self.price_unit = price
-            self.tax_ids = self.product_id.taxes_id
+            self.tax_ids = self.product_id.taxes_id.filtered(lambda r: not self.company_id or r.company_id == self.company_id)
+            fpos = self.order_id.fiscal_position_id
+            tax_ids_after_fiscal_position = fpos.map_tax(self.tax_ids) if fpos else self.tax_ids
+            self.price_unit = self.env['account.tax']._fix_tax_included_price(price, self.product_id.taxes_id, tax_ids_after_fiscal_position)
 
     @api.onchange('qty', 'discount', 'price_unit', 'tax_ids')
     def _onchange_qty(self):
diff --git a/addons/web_editor/models/ir_http.py b/addons/web_editor/models/ir_http.py
index c72fee55e83..874ccc6eddb 100644
--- a/addons/web_editor/models/ir_http.py
+++ b/addons/web_editor/models/ir_http.py
@@ -11,6 +11,6 @@ class ir_http(orm.AbstractModel):
             request.context['editable'] = True
         if 'edit_translations' in request.httprequest.args and 'edit_translations' not in request.context:
             request.context['edit_translations'] = True
-        if request.context.get('lang') != "en_US" and 'translatable' not in request.context:
+        if request.context.get('edit_translations') and 'translatable' not in request.context:
             request.context['translatable'] = True
         return super(ir_http, self)._dispatch()
diff --git a/addons/website/models/ir_http.py b/addons/website/models/ir_http.py
index dac8468fb3c..6986aabe20e 100644
--- a/addons/website/models/ir_http.py
+++ b/addons/website/models/ir_http.py
@@ -160,7 +160,7 @@ class ir_http(orm.AbstractModel):
                     request.uid = None
                     path.pop(1)
                     return self.reroute('/'.join(path) or '/')
-            if path[1] == request.website.default_lang_code:
+            if request.lang == request.website.default_lang_code:
                 request.context['edit_translations'] = False
             if not request.context.get('tz'):
                 request.context['tz'] = request.session.get('geoip', {}).get('time_zone')