Add 5 new languages to exampleSite: German, French, Spanish, Portuguese

Add complete translations for:
- German (de)
- French (fr)
- Spanish (es)
- Portuguese Brazil (pt-br)
- Portuguese Portugal (pt-pt)

Changes include:
- Language config files (languages.*.toml)
- Menu config files (menus.*.toml)
- Translated docs section (16 files x 5 langs)
- Translated homepage, guides, samples
- Translated examples, authors, tags sections
- Translated users section (112 dirs x 5 langs)
- Fixed YAML front matter formatting in user files

Hugo build now supports 9 languages total.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

exampleSite/content/authors/secondauthor/_index.de.md

@@ -0,0 +1,5 @@
+---
+title: "Dummy Second Author"
+---
+
+Die fantastische Beispielbiografie des zweiten Beispielautors.

exampleSite/content/authors/secondauthor/_index.es.md

@@ -0,0 +1,5 @@
+---
+title: "Dummy Second Author"
+---
+
+La increíble biografía ficticia del segundo autor ficticio.

exampleSite/content/authors/secondauthor/_index.fr.md

@@ -0,0 +1,5 @@
+---
+title: "Dummy Second Author"
+---
+
+La super bio fictive du deuxième auteur fictif.

exampleSite/content/authors/secondauthor/_index.pt-br.md

@@ -0,0 +1,5 @@
+---
+title: "Dummy Second Author"
+---
+
+A incrível bio fictícia do segundo autor fictício.

exampleSite/content/authors/secondauthor/_index.pt-pt.md

@@ -0,0 +1,5 @@
+---
+title: "Dummy Second Author"
+---
+
+A fantástica biografia fictícia do segundo autor fictício.