User returns to wrong shop language after login via Amazon

[timoterhaar]

Shop Configuration:

• Multiple frontend languages:
  • English with language ID 0
  • German with language ID 1 (default language)

Scenario:

• You are using the Safari browser
• You are on the german shop frontend (basket page) and click the amazon pay button
• You successfully log in with your Amazon credentials
• After the shop page gets reloaded you are on the english shop frontend (checkout user page)

Solution:
Add the following language parameter to all return urls: &lang=[{$oViewConf->getActLanguageId()}]

Example bestitamazonpay4oxid_paybutton.tpl (line 85):

var newLocation = '[{$oViewConf->getSslSelfLink()|html_entity_decode}]'
    + 'cl=user&fnc=amazonLogin&redirectCl=user&lang=[{$oViewConf->getActLanguageId()}]'
    + '&amazonOrderReferenceId=' + amazonOrderReferenceId
    + '&access_token=' + addressConsentToken;