feat: add bilingual blog post about digital media literacy for children

Add new blog post "Ein alter Laptop, Linux und Pi-hole: Digitale
Medienkompetenz für Kinder" in German and English, covering setting up
a child's first computer with Ubuntu and Pi-hole, open source philosophy,
and the balance between protection and freedom.

Also adds i18n support for localized month names in date formatting
across blog templates.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

i18n/de.yaml

@@ -0,0 +1,12 @@
+month_1: "Januar"
+month_2: "Februar"
+month_3: "März"
+month_4: "April"
+month_5: "Mai"
+month_6: "Juni"
+month_7: "Juli"
+month_8: "August"
+month_9: "September"
+month_10: "Oktober"
+month_11: "November"
+month_12: "Dezember"

i18n/en.yaml

@@ -0,0 +1,12 @@
+month_1: "January"
+month_2: "February"
+month_3: "March"
+month_4: "April"
+month_5: "May"
+month_6: "June"
+month_7: "July"
+month_8: "August"
+month_9: "September"
+month_10: "October"
+month_11: "November"
+month_12: "December"