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>

openspec/changes/add-ubuntu-kids-article/proposal.md

@@ -0,0 +1,53 @@
+# Proposal: Add Ubuntu for Kids Blog Post
+
+## Context
+
+Create a new bilingual blog post based on Notion content about setting up a child's first computer with Ubuntu and Pi-hole. The post reflects on digital media literacy, open source philosophy, and finding the balance between protection and freedom in the digital age.
+
+## Motivation
+
+This blog post:
+- Shares a practical approach to introducing children to computers with Linux
+- Explores the philosophical aspects of open source vs. proprietary software
+- Addresses real parenting challenges around digital media literacy
+- Discusses cyberbullying, doom-scrolling, AI content verification, and other modern challenges
+- Provides both German and English versions for broader reach
+
+## Scope
+
+### In Scope
+- Create new blog post page bundle with German directory `content/blog/ubuntu-fuer-kinder/`
+- Create new blog post page bundle with English directory `content/blog/ubuntu-for-kids/`
+- German version (original from Notion)
+- English version (translated)
+- Proper frontmatter with title, date, description, translationKey
+- All formatting and structure preserved
+- Validation that post renders correctly in Hugo
+
+### Out of Scope
+- No changes to existing blog posts
+- No template or layout modifications
+- No Hugo configuration changes
+- No new images or assets
+
+## Dependencies
+
+None. This is a new content addition that doesn't affect existing functionality.
+
+## Risks
+
+Low risk. Adding new content only, no structural changes.
+
+## Success Criteria
+
+- Blog post exists in both German and English with translated URL slugs
+- Content accurately reflects Notion source
+- English translation is natural and maintains meaning
+- Hugo builds successfully
+- Post displays correctly in both languages
+- Language switcher works between versions
+- OpenSpec validation passes
+
+## Related Changes
+
+Similar to 2025-11-25-add-dialogbasierte-anwendungen-post.