[Python] How to pass context to a report in odoo 15

i have this problem.

I want to set the lang to a report through the context like this:

from odoo import api, fields, models

class IncLoadUnloadMovement(models.TransientModel):
_name = 'inc.load.unload.movement'
_description = 'Wizard para imprimir orden con selección de idioma'

movement_id = fields.Many2one(
comodel_name='inc.movement',
string="Movimiento",
required=True,
default=lambda self: self.env.context.get('default_movement_id')
)

lang = fields.Selection(
selection=lambda self: self._get_lang_selection(),
string="Idioma",
required=True,
default=lambda self: self.env.user.lang
)

@api.model
def _get_lang_selection(self):
langs = self.env['res.lang'].search([('code', 'in', ['es_ES', 'en_US'])], order='name')
return [(lang.code, lang.name) for lang in langs]

def action_print_load(self):
self.ensure_one()
report = self.env.ref('inc_trans_euconsa.action_report_load_temp')
return report.with_context(lang=self.lang).report_action(self.movement_id)

def action_print_unload(self):
self.ensure_one()
report = self.env.ref('inc_trans_euconsa.action_report_unload_temp')
return report.with_context({'lang': self.lang}).report_action(self.movement_id)


But my reports are still downloading in Spanish.

I tried this 2 ways to set the context but none works

And, in my report I have this:

<template id="report_load_order_template_lang">
<t t-call="web.html_container">
<t t-foreach="docs" t-as="o">
<t t-call="inc_trans_euconsa.report_load_order_template" t-lang="en_US"/>
</t>
</t>
</template>

<template id="report_unload_order_template_lang">
<t t-call="web.html_container">
<t t-foreach="docs" t-as="o">
<t t-call="inc_trans_euconsa.report_unload_order_template" t-lang="env.context.get('lang')"/>
</t>
</t>
</template>


The first report, obviously is downloaded in English, but the second one only in Spanish

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