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/tasks.md

@@ -0,0 +1,38 @@
+# Tasks: Add Ubuntu for Kids Blog Post
+
+## Implementation Tasks
+
+1. **Create blog post directory structure**
+   - Create `content/blog/ubuntu-fuer-kinder/` directory for German
+   - Create `content/blog/ubuntu-for-kids/` directory for English
+   - Set up page bundles for bilingual content with translationKey linking
+
+2. **Create German blog post**
+   - Create `content/blog/ubuntu-fuer-kinder/index.de.md`
+   - Add YAML frontmatter with title, date, description, translationKey
+   - Transfer content from Notion source
+   - Preserve all formatting, structure, and sections
+   - Verify markdown rendering
+
+3. **Create English blog post**
+   - Create `content/blog/ubuntu-for-kids/index.en.md`
+   - Add YAML frontmatter with translated title, date, description, translationKey
+   - Create natural English translation maintaining technical accuracy
+   - Adapt terminology appropriately for English readers
+   - Verify markdown rendering
+
+4. **Validate implementation**
+   - Run `openspec validate add-ubuntu-kids-article --strict`
+   - Resolve any validation issues
+
+5. **Test Hugo build**
+   - Run `hugo server`
+   - Verify no build errors
+   - Check both German and English versions render correctly
+   - Verify language switcher works between versions
+   - Test responsive layout
+
+6. **Review and commit**
+   - Review generated content
+   - Create git commit with conventional commit message
+   - Ready for user review before merging to main