[Bug] Default language not respected when accessing site without language-specific endpoint

[xhypeDE]

What happened?

The default language setting of my Shopware PWA site is not being respected when accessing the site without a language-specific endpoint in the URL. Even though English is set as the default language in my configuration, the site defaults to displaying content in German when accessed at the root domain (without the /en/ endpoint).

Steps To Reproduce

• Configure a Shopware PWA site to support both English and German languages.
• Set English as the default language in the configuration.
• Access the English version of the site at https://pwa.newjoy.devla.dev/en/. The content is correctly displayed in English.
• Use the language switcher component on the site to switch to English. The site correctly redirects to the /en/ endpoint and displays the content in English.
• Access the site without the /en/ endpoint, i.e., at https://pwa.newjoy.devla.dev/. Despite English being the default language, the site displays content in German.

Additional notes:

Given the behavior, the potential causes might be:

• Shopware may be using German as the fallback language.
• The default sales channel might be set to German.
• Shopware's URL routing might be defaulting to German when no language is specified in the URL.
• The site might be defaulting to the language specified in the browser settings (though this is unlikely as the issue persists across different browsers and devices).

Is there an existing issue for this?

• I have searched the existing issues

Version

Contribution (cloned/forked from GH)

Which element is affected?

shopware-6-client

Environment

- OS: Ubuntu 20.04.2 LTS
- Node: 16.13.0
- Shopware API: v6.4.7.0 Stable Version
- Shopware PWA version: 1.0.2

Relevant log output

There is no specific error log output related to this issue. The site functions as expected, but the default language is not respected when no language-specific endpoint is provided in the URL.