Empty defaultCpLanguage sets initial account language to German on visiting and saving Account page

[rungta]

Description

A fresh Craft install with no custom value for the defaultCpLanguage config, and a single site with the language set to a region specific English (like en-in) does not appear to explicitly assign a language for the initial user account. This leads to the user account being assigned the first option from the list of supported languages in the Language dropdown on the My Account page, and saving that page results in the user's language inadvertently switching to German. The issue does not effect any subsequent accounts created from inside the control panel, just the initial account created during the setup process.

Steps to reproduce

1. Create a fresh Craft CMS install
2. During the setup, pick a region specific English, like en-IN as the default site's Language.
3. Complete the setup process
4. Visit the default user's My Account page
5. Save

Additional info

• Craft version: 3.0.16.1
• PHP version: 7.1
• Database driver & version: MySQL

[brandonkelly]

With Dev Mode enabled, please create a test template with this in it:

{{ dump(craft.app.request.getAcceptableLanguages()) }}

Can you tell me what that outputs when you access it from a browser?

[rungta]

array(4) {
  [0]=>
  string(5) "en-GB"
  [1]=>
  string(2) "en"
  [2]=>
  string(5) "en-US"
  [3]=>
  string(2) "hi"
}

[brandonkelly]

Thanks! Fixed for today’s release.