diff --git a/content/de/posts/Route_Hansaplatz_mit_Beschreibung.png b/content/de/posts/2024-12-29-hansaplatz/Route_Hansaplatz_mit_Beschreibung.png
similarity index 100%
rename from content/de/posts/Route_Hansaplatz_mit_Beschreibung.png
rename to content/de/posts/2024-12-29-hansaplatz/Route_Hansaplatz_mit_Beschreibung.png
diff --git a/content/de/posts/2024-12-29-hansaplatz.md b/content/de/posts/2024-12-29-hansaplatz/index.md
similarity index 100%
rename from content/de/posts/2024-12-29-hansaplatz.md
rename to content/de/posts/2024-12-29-hansaplatz/index.md
diff --git a/i18n/de.yaml b/i18n/de.yaml
index d85697f..900c88b 100644
--- a/i18n/de.yaml
+++ b/i18n/de.yaml
@@ -8,4 +8,7 @@ map_39c3_title: "Karte der 39C3-Touren mit Wegen vom CCH (uMap)"
 calendar_meeting_point: "Hackertours-Desk"
 calendar_ics: "iCal Download"
 calendar_google: "Google Calendar"
+skip_to_content: "Zum Inhalt springen"
+logo_alt: "Hamburg Hackertours – Startseite"
+map_39c3_title: "Karte der 39C3-Touren mit Wegen vom CCH (uMap)"
 schedule_soldout: "ausgebucht"
diff --git a/i18n/en.yaml b/i18n/en.yaml
index af56ac6..acb7f30 100644
--- a/i18n/en.yaml
+++ b/i18n/en.yaml
@@ -8,4 +8,7 @@ map_39c3_title: "Map of the 39C3 tours with routes from the CCH (uMap)"
 calendar_meeting_point: "Hackertours Desk"
 calendar_ics: "iCal download"
 calendar_google: "Google calendar"
+skip_to_content: "Skip to content"
+logo_alt: "Hamburg Hackertours – home page"
+map_39c3_title: "Map of the 39C3 tours with routes from the CCH (uMap)"
 schedule_soldout: "fully booked"
diff --git a/layouts/_partials/head/extra.html b/layouts/_partials/head/extra.html
new file mode 100644
index 0000000..8a5efda
--- /dev/null
+++ b/layouts/_partials/head/extra.html
@@ -0,0 +1,40 @@
+{{- /*
+Open Graph image for link previews. The theme's head/meta.html writes og:image only for the
+"image" param; without it, this uses the first image in the page's Markdown, scaled down to at
+most 1200 pixels wide, with its alt text as og:image:alt.
+*/ -}}
+{{- if not ($.Param "image") -}}
+  {{- with findRESubmatch `!\[([^\]]*)\]\(\s*<?([^\s)>]+)` .RawContent 1 -}}
+    {{- $alt := index . 0 1 -}}
+    {{- $dest := index . 0 2 -}}
+    {{- $url := "" -}}
+    {{- $width := 0 -}}
+    {{- $height := 0 -}}
+    {{- $resource := false -}}
+    {{- if findRE `^https?://` $dest -}}
+      {{- $url = $dest -}}
+    {{- else -}}
+      {{- $resource = or ($.Resources.Get (strings.TrimPrefix "./" $dest)) (resources.Get $dest) -}}
+    {{- end -}}
+    {{- with $resource -}}
+      {{- $image := . -}}
+      {{- if and (eq .ResourceType "image") (ne .MediaType.SubType "svg") -}}
+        {{- if gt .Width 1200 }}{{ $image = .Resize "1200x" }}{{ end -}}
+        {{- $width = $image.Width -}}
+        {{- $height = $image.Height -}}
+      {{- end -}}
+      {{- $url = $image.Permalink -}}
+    {{- end -}}
+    {{- with $url }}
+<meta property="og:image" content="{{ . }}">
+{{- with $width }}
+<meta property="og:image:width" content="{{ . }}">
+<meta property="og:image:height" content="{{ $height }}">
+{{- end }}
+{{- with $alt }}
+<meta property="og:image:alt" content="{{ . }}">
+{{- end }}
+<meta name="twitter:card" content="summary_large_image">
+    {{- end -}}
+  {{- end -}}
+{{- end -}}