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/samples/external/index.pt-br.md

@@ -0,0 +1,15 @@
+---
+title: "Um artigo externo"
+date: 2019-01-24
+externalUrl: "https://n9o.xyz/projects/"
+summary: "O parâmetro front matter `externalUrl` pode vincular a qualquer URL."
+showReadingTime: true
+build:
+  render: "false"
+  list: "local"
+type: 'sample'
+---
+
+Esta página usa o parâmetro front matter `externalUrl` para vincular a um artigo fora deste site Hugo.
+
+É ótimo para coisas como vincular a publicações no Medium ou a artigos de pesquisa que você pode ter hospedados em sites de terceiros.