[FIX] email_template: encode date/datetime format
[FIX] email_template: encode date/datetime format

See more details here: odoo/odoo@6191e3f6d0d064de9acdf0d1455b7de589dddb5a

This commit closes #13704

laslabs/odoo,leorochael/odoo,dfang/odoo,Daniel-CA/odoo,NeovaHealth/odoo,storm-computers/odoo,ehirt/odoo,Adel-Magebinary/odoo,Noviat/odoo,datenbetrieb/odoo,spadae22/odoo,Adel-Magebinary/odoo,vnsofthe/odoo,Daniel-CA/odoo,diagramsoftware/odoo,ygol/odoo,Daniel-CA/odoo,Nowheresly/odoo,CatsAndDogsbvba/odoo,Nowheresly/odoo,funkring/fdoo,ehirt/odoo,alexcuellar/odoo,NeovaHealth/odoo,synconics/odoo,ehirt/odoo,datenbetrieb/odoo,CatsAndDogsbvba/odoo,laslabs/odoo,tvibliani/odoo,synconics/odoo,ygol/odoo,Elico-Corp/odoo_OCB,odootr/odoo,bplancher/odoo,bplancher/odoo,hip-odoo/odoo,dfang/odoo,odootr/odoo,CatsAndDogsbvba/odoo,spadae22/odoo,CatsAndDogsbvba/odoo,OpenUpgrade/OpenUpgrade,OpenUpgrade/OpenUpgrade,makinacorpus/odoo,alexcuellar/odoo,dfang/odoo,glovebx/odoo,spadae22/odoo,OpenUpgrade/OpenUpgrade,Nowheresly/odoo,ehirt/odoo,mustafat/odoo-1,OpenUpgrade/OpenUpgrade,Daniel-CA/odoo,spadae22/odoo,datenbetrieb/odoo,datenbetrieb/odoo,leorochael/odoo,odootr/odoo,CatsAndDogsbvba/odoo,microcom/odoo,funkring/fdoo,dfang/odoo,funkring/fdoo,bplancher/odoo,tvibliani/odoo,glovebx/odoo,Nowheresly/odoo,makinacorpus/odoo,laslabs/odoo,hip-odoo/odoo,BT-ojossen/odoo,NeovaHealth/odoo,diagramsoftware/odoo,Daniel-CA/odoo,alexcuellar/odoo,spadae22/odoo,Elico-Corp/odoo_OCB,microcom/odoo,diagramsoftware/odoo,vnsofthe/odoo,datenbetrieb/odoo,funkring/fdoo,hip-odoo/odoo,tvibliani/odoo,glovebx/odoo,storm-computers/odoo,NeovaHealth/odoo,datenbetrieb/odoo,Elico-Corp/odoo_OCB,makinacorpus/odoo,glovebx/odoo,NeovaHealth/odoo,BT-ojossen/odoo,mustafat/odoo-1,hip-odoo/odoo,bplancher/odoo,Noviat/odoo,storm-computers/odoo,OpenUpgrade/OpenUpgrade,laslabs/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,leorochael/odoo,synconics/odoo,NeovaHealth/odoo,leorochael/odoo,Noviat/odoo,ygol/odoo,ehirt/odoo,synconics/odoo,ygol/odoo,CatsAndDogsbvba/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,Nowheresly/odoo,dfang/odoo,alexcuellar/odoo,Adel-Magebinary/odoo,funkring/fdoo,vnsofthe/odoo,microcom/odoo,funkring/fdoo,funkring/fdoo,NeovaHealth/odoo,Noviat/odoo,mustafat/odoo-1,spadae22/odoo,tvibliani/odoo,OpenUpgrade/OpenUpgrade,makinacorpus/odoo,odootr/odoo,diagramsoftware/odoo,synconics/odoo,odootr/odoo,storm-computers/odoo,ygol/odoo,Adel-Magebinary/odoo,odootr/odoo,alexcuellar/odoo,leorochael/odoo,mustafat/odoo-1,BT-ojossen/odoo,storm-computers/odoo,Adel-Magebinary/odoo,diagramsoftware/odoo,vnsofthe/odoo,spadae22/odoo,alexcuellar/odoo,microcom/odoo,makinacorpus/odoo,ygol/odoo,mustafat/odoo-1,alexcuellar/odoo,bplancher/odoo,tvibliani/odoo,makinacorpus/odoo,tvibliani/odoo,BT-ojossen/odoo,leorochael/odoo,BT-ojossen/odoo,storm-computers/odoo,Nowheresly/odoo,datenbetrieb/odoo,Nowheresly/odoo,OpenUpgrade/OpenUpgrade,ygol/odoo,mustafat/odoo-1,leorochael/odoo,hip-odoo/odoo,Adel-Magebinary/odoo,Noviat/odoo,vnsofthe/odoo,Noviat/odoo,makinacorpus/odoo,Daniel-CA/odoo,CatsAndDogsbvba/odoo,microcom/odoo,BT-ojossen/odoo,vnsofthe/odoo,Elico-Corp/odoo_OCB,Daniel-CA/odoo,glovebx/odoo,Adel-Magebinary/odoo,synconics/odoo,odootr/odoo,Noviat/odoo,vnsofthe/odoo,mustafat/odoo-1,synconics/odoo,diagramsoftware/odoo,microcom/odoo,laslabs/odoo,BT-ojossen/odoo,ehirt/odoo,glovebx/odoo,dfang/odoo,ehirt/odoo,diagramsoftware/odoo,laslabs/odoo,glovebx/odoo,tvibliani/odoo