fix: define legal pages as German content

Author: Obnoxieux

src/pages/impressum.astro

@@ -22,7 +22,7 @@ const contactAddress = getSecret("PUBLIC_CONTACT_ADDRESS");
 
 <Layout title={pageTitle} description={description} metaTags={metaTags}>
   <div class="flex flex-col min-w-full md:w-screen max-w-[90%] lg:max-w-[70%]">
-    <div class="prose">
+    <div class="prose" lang="de">
       <h1>Impressum</h1>
       <h2>Angaben gem&auml;&szlig; &sect; 5 TMG</h2>
       <p>David Battefeld<br/>

src/pages/privacy.astro

@@ -22,7 +22,7 @@ const contactAddress = getSecret("PUBLIC_CONTACT_ADDRESS");
 
 <Layout title={pageTitle} description={description} metaTags={metaTags}>
   <div class="flex flex-col min-w-full md:w-screen max-w-[90%] lg:max-w-[70%]">
-    <div class="prose">
+    <div class="prose" lang="de">
       <h1 class="h1">Datenschutz&shy;erkl&auml;rung</h1>
       <h2 class="h2">1. Datenschutz auf einen Blick</h2>
       <h3>Allgemeine Hinweise</h3>