style: update typography and enhance OrganisationsBlock layout

- Changed comment in app.css to reflect German terminology for quotes.
- Added Button component to OrganisationsBlock for improved call-to-action presentation.
- Adjusted button styling and layout in OrganisationsBlock for better responsiveness and visual consistency.

src/lib/components/blocks/OrganisationsBlock.svelte

@@ -8,6 +8,7 @@
   import Card from "$lib/components/Card.svelte";
   import Badge from "$lib/components/Badge.svelte";
   import RustyImage from "$lib/components/RustyImage.svelte";
+  import Button from "$lib/ui/Button.svelte";
 
   marked.setOptions({ gfm: true });
 
@@ -112,23 +113,29 @@
     href={addOrganisationCtaLink?.url}
     target={addOrganisationCtaLink?.newTab ? "_blank" : undefined}
     rel={addOrganisationCtaLink?.newTab ? "noopener noreferrer" : undefined}
-    class="h-full"
+    class="h-full w-full max-w-full md:max-w-md"
   >
     {#if block.addOrganisationTitle}
-      <h5 class="text-sm font-semibold text-wald-800 leading-snug">{block.addOrganisationTitle}</h5>
+      <h5 class="text-xl font-semibold text-wald-800 leading-snug">{block.addOrganisationTitle}</h5>
     {/if}
     {#if ctaHtml}
       <div class="markdown text-xs text-wald-700">{@html ctaHtml}</div>
     {/if}
     {#if addOrganisationCtaLink}
-      <p class="mb-0 mt-1 text-xs font-medium text-wald-800">{addOrganisationCtaLink.linkName}</p>
+      <div class="self-start">
+        <Button variant="primary" size="sm">
+          {addOrganisationCtaLink.linkName}
+        </Button>
+      </div>
     {/if}
   </Card>
 {/snippet}
 
 <div class={layoutClasses} data-block-type="organisations" data-block-slug={block._slug}>
   {#if block.headline}
-    <h3 class={compact ? "mb-2 text-lg font-semibold text-stein-900" : "mb-4"}>{block.headline}</h3>
+    <h3
+      class={compact ? "mb-2 text-lg font-semibold text-stein-900" : "mb-4"}
+    >{block.headline}</h3>
   {/if}
 
   {#if carousel}