Persist the language cookie when changing language

backport nexedi/erp5!506

https://www.erp5.com/project_section/capago-project/forum/Widget-preference-not-recorded-qIzYcKy7dK/view?list_start=2&reset=1#2013576401

> We can probably change this to make changing language this way more permanent. I'll discuss this with others in Nexedi.



/reviewed-on https://lab.nexedi.com/nexedi/erp5-capago/merge_requests/6

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/Base_doLanguage.py

@@ -37,4 +37,4 @@ else:
   if not select_language:
     select_language = portal.Localizer.get_selected_language()
 
-  portal.Localizer.changeLanguage(select_language)
+  portal.Localizer.changeLanguage(select_language, expires=(DateTime() + 365).toZone('GMT').rfc822())

product/ERP5Type/tests/utils.py

@@ -169,7 +169,7 @@ class DummyLocalizer:
 
   get_languages = get_supported_languages
 
-  def changeLanguage(self, lang):
+  def changeLanguage(self, lang, expires=None):
     self.lang = lang
 
   def translate(self, domain, msgid, lang=None, mapping=None, *args, **kw):