Use flag for language selector icon

[jonaharagon]

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[kamilkrzyskow]

The hook replaces on the fly the mkdocs-material site-packages raw header.html partial https://github.com/squidfunk/mkdocs-material/blob/master/material/partials/header.html.
You have your own https://github.com/privacyguides/privacyguides.org/blob/main/theme/partials/header.html partial which "overwrites" the changes made by the hook.
Also I worked with the Public version, I don't know if Insiders made any changes to the partial, but I doubt it, because otherwise the hook would log a warning.

[jonaharagon]

@kamilkrzyskow yeah I was testing without that override and it still didn't work, but it seems to be related to #2063 in that case, which is yet another entirely unrelated bug :)

Anyways I can just do this a different way with jinja formatting it turns out, so I'll just go with that for now. Ideally theme/partials/header.html could be replaced with dynamic overrides like in squidfunk/mkdocs-material#5060 in the long-term, but at the moment I'm not good enough at Python to figure that out.

[kamilkrzyskow]

Your solution with the additional icon in the alternate is very clean. I really like it.

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I mentioned your partial override, because the commit didn't remove it.
As for the #2063, you're most likely correct, as the on_post_page event includes the changes made by the hook.
But why would it crash for an .svg external resource with some Empty Document error 🤔

I tested the hook locally and after removing your custom partial it works fine 😮‍💨 (of course this is the old Public version without the privacy plugin).

[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/v3-3/11950/1