[FIX] web: user_context
[FIX] web: user_context

The custom filters were not translated in the user language(FR) when:
-Going to Marketing / Mass mailing
-Creating a new one
-Selecting "customers"
-Clicking "select records"
-In the modal, clicking Filtres / Add custom filter

To have the user_context, the context sent to fields_get must be taken
with get_context.

opw:647495

optima-ict/odoo,optima-ict/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,syci/OCB,bplancher/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,microcom/odoo,optima-ict/odoo,bplancher/odoo,hip-odoo/odoo,syci/OCB,syci/OCB,dfang/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,storm-computers/odoo,hip-odoo/odoo,optima-ict/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,microcom/odoo,bplancher/odoo,dfang/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,ygol/odoo,microcom/odoo,sysadminmatmoz/OCB,ygol/odoo,microcom/odoo,sysadminmatmoz/OCB,stephen144/odoo,laslabs/odoo,dfang/odoo,bplancher/odoo,laslabs/odoo,dfang/odoo,ygol/odoo,ygol/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,dfang/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,optima-ict/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,syci/OCB,ygol/odoo,storm-computers/odoo,microcom/odoo,sysadminmatmoz/OCB,stephen144/odoo,laslabs/odoo,optima-ict/odoo,stephen144/odoo,storm-computers/odoo,syci/OCB,stephen144/odoo,microcom/odoo,syci/OCB,stephen144/odoo,ygol/odoo,stephen144/odoo,laslabs/odoo,ygol/odoo