feat: make Docker container port configurable via PORT env var

fix: preserve original filename when downloading processed files

public/locales/pt/common.json

@@ -5,6 +5,7 @@
     "contact": "Contato",
     "licensing": "Licenciamento",
     "allTools": "Todas as Ferramentas",
+    "docs": "Docs",
     "openMainMenu": "Abrir menu principal",
     "language": "Idioma"
   },