[FIX] rating, rating_{*}: translations

Several translation issues are faced with the rating module:
- the feedback page is always displayed in the admin language
- the feedback emails are always sent in the user's language

One would expect these to be in the partner language.

opw-694718

addons/rating/controllers/main.py

@@ -21,8 +21,9 @@ class Rating(http.Controller):
             1: _("highly dissatisfied"),
             10: _("satisfied")
         }
-        rating.sudo().write({'rating': rate, 'consumed': True})
-        return request.render('rating.rating_external_page_submit', {
+        rating.write({'rating': rate, 'consumed': True})
+        lang = rating.partner_id.lang or 'en_US'
+        return request.env['ir.ui.view'].with_context(lang=lang).render_template('rating.rating_external_page_submit', {
             'rating': rating, 'token': token,
             'rate_name': rate_names[rate], 'rate': rate
         })
@@ -37,7 +38,8 @@ class Rating(http.Controller):
         # redirect to the form view if logged person
         if request.session.uid:
             return werkzeug.utils.redirect('/web#model=%s&id=%s&view_type=form' % (record_sudo._name, record_sudo.id))
-        return request.render('rating.rating_external_page_view', {
+        lang = rating.partner_id.lang or 'en_US'
+        return request.env['ir.ui.view'].with_context(lang=lang).render_template('rating.rating_external_page_view', {
             'web_base_url': request.env['ir.config_parameter'].sudo().get_param('web.base.url'),
             'rating': rating,
         })

addons/rating/models/rating.py

@@ -92,8 +92,10 @@ class RatingMixin(models.AbstractModel):
     def rating_send_request(self, template, partner=None, rated_partner=None, reuse_rating=True, force_send=True):
         """ This method send rating request by email, using a template given
         in parameter. """
+        partner = (partner or self.env['res.partner']).sudo()
         for record in self:
-            template.send_mail(record.id, force_send=force_send)
+            lang = partner.lang or 'en_US'
+            template.with_context(lang=lang).send_mail(record.id, force_send=force_send)
 
     @api.multi
     def rating_apply(self, rate, token=None, feedback=None, subtype=None):

addons/rating_project/models/project.py

@@ -41,7 +41,7 @@ class Task(models.Model):
             rating_template = task.stage_id.rating_template_id
             if rating_template:
                 force_send = self.env.context.get('force_send', True)
-                task.rating_send_request(rating_template, reuse_rating=False, force_send=force_send)
+                task.rating_send_request(rating_template, partner=task.partner_id, reuse_rating=False, force_send=force_send)
 
     def rating_get_partner_id(self):
         res = super(Task, self).rating_get_partner_id()

addons/rating_project_issue/models/project_issue.py

@@ -22,7 +22,7 @@ class ProjectIssue(models.Model):
         for issue in self:
             rating_template = issue.stage_id.rating_template_id
             if rating_template:
-                issue.rating_send_request(rating_template, reuse_rating=False)
+                issue.rating_send_request(rating_template, partner=issue.partner_id, reuse_rating=False)
 
     @api.multi
     def rating_apply(self, rate, token=None, feedback=None, subtype=None):