[GitHub] fix html lang attribute

[shopwareBot]

1. Why is this change necessary?

In case, you use inherited language, the html lang attribute is empty.

2. What does this change do, exactly?

• Changed HeaderPageletLoader::getLanguages to load associated locale
• Changed base.html.twig to use activeLanguage.locale instead of activeLanguage.translationCode. In case of inherited languages, the translationCode is null, whereas locale stores the inherited locale.

3. Describe each step to reproduce the issue or behaviour.

1. Create a language, that inherits another language.
2. Assign the language to your storefront.
3. Open the storefront in that language.
4. Check the lang attribute in the html tag.

4. Please link to the relevant issues (if any).

5. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change <- I couldn't think of a useful test for this
• I have created a changelog file with all necessary information about my changes
• I have read the contribution requirements and fulfil them.

copilot:summary

copilot:walkthrough

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Imported from Github. Please see: #3070

[shopware-issue-bot]

We found the following existing issues which may help or are related to your topic:

• fix html lang attribute
• [Github] Fix admin i18n tags
• HTML lang tag uses the snippet set locale instead of the locale from the language

[shopwareBot]

[public] Shopware automated response: This issue is linked to the internal issue: NEXT-26889

[created from NEXT-26889, comment 514971]