[FIX] mail: use template lang on layout and display name

Steps:
- Install sale
- Go to Settings / Translations / Languages
- Activate Dutch
- Go to Settings / Users & Companies / Users
- Edit demo
  - Language: Dutch
- Go to Sales
- Create a quotation:
  - Customer: demo
- Go to Settings / Technical / Automation / Scheduled Actions
- Create a new action:
  - Model: Sales Order
  - Python code:
  ```python
  last_id = model.search([], order='id desc', limit=1)[0].id
  env.ref('sale.email_template_edi_sale').send_mail(last_id, notif_layout='mail.mail_notification_paynow')
  ```
- Click "Run Manually"
- Go to Settings / Technical / Email / Emails
- Open the last email you just sent

Bug:
Parts of the email are not in Dutch

Explanation:
This commit makes a template pass the rendering language to the layout
and the display name when calling `template.send_mail()`.

opw:2467640

closes odoo/odoo#68656

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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