i18n(de): add German gender note to index page

[trueberryless]

Description

The German translation of Astro docs only uses the male form for gendering¹ because German gender rules make sentence structures often unreadable and would ruin the flow of documentation.

We therefore decided (back when we translated the tutorial I think) that we will add a gender notice somewhere, but haven't really discussed where to add it.

This PR proposes to add additional content to the translated "index" page of the Astro documentation to clearly state that we only use the male form for smoother readability. The full statement translated to English reads:

For the sake of readability, this documentation employs gender-neutral phrasing. Any personal titles or pronouns used are intended to include all genders, identities, and backgrounds equally. Our community thrives on diversity — we deeply value ensuring that everyone feels welcome, respected, and included here.

Footnotes

1. This is also stated in our i18n guide under the sixth point of our Style Guide, which translates to:

   We have decided against using gender-neutral language in our translations because it makes the texts harder to read, and there are currently no guidelines from Duden (official German dictionary) on the matter. We prefer to avoid gender-specific phrasing in our translations and word the texts in such a way that no one feels excluded.

   ↩

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[randomguy-2650]

I have left a note on the original PR stating something about gendering as it is a slightly different case compared to the rabbit hole we went into during the big tutorial PR.

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By the way, we could probably swap out some “generic masculine” terms for gender‐neutral ones, let me give you some examples to clarify what I mean:

• Lehrer -> Lehrkraft
• But not: Student -> Studierende (because nobody uses this, it sounds utterly weird)

[trueberryless]

By the way, we could probably swap out some “generic masculine” terms for gender‐neutral ones, let me give you some examples to clarify what I mean:

* Lehrer -> Lehrkraft

* But not: Student -> Studierende (because nobody uses this, it sounds utterly weird)

Yes, but let's do that in another PR and not block this one 👍