✨ Añade ejemplo de barra de menú de navegación

src/locale/en-US/sample.ftl

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+# menus.rs
+sample_menus_item_label = Label
+sample_menus_item_link = Link
+sample_menus_item_blank = External link
+sample_menus_item_disabled = Disabled link
+
+sample_menus_test_title = Dropdown
+
+sample_menus_dev_header = Intro
+sample_menus_dev_getting_started = Getting started
+sample_menus_dev_guides = Development guides
+sample_menus_dev_forum = Developers forum
+
+sample_menus_sdk_header = Software Development Kits
+sample_menus_sdk_rust = SDKs Rust
+sample_menus_sdk_js = SDKs JavaScript
+sample_menus_sdk_python = SDKs Python
+
+sample_menus_plugin_header = Plugins
+sample_menus_plugin_auth = Rust Plugin Auth
+sample_menus_plugin_cache = Rust Plugin Cache
+
+sample_menus_item_sign_up = Sign up
+sample_menus_item_login = Login

src/locale/es-ES/sample.ftl

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+# menus.rs
+sample_menus_item_label = Etiqueta
+sample_menus_item_link = Enlace
+sample_menus_item_blank = Enlace externo
+sample_menus_item_disabled = Enlace deshabilitado
+
+sample_menus_test_title = Desplegable
+
+sample_menus_dev_header = Introducción
+sample_menus_dev_getting_started = Primeros pasos
+sample_menus_dev_guides = Guías de desarrollo
+sample_menus_dev_forum = Foro de desarrolladores
+
+sample_menus_sdk_header = Kits de Desarrollo Software
+sample_menus_sdk_rust = SDKs de Rust
+sample_menus_sdk_js = SDKs de JavaScript
+sample_menus_sdk_python = SDKs de Python
+
+sample_menus_plugin_header = Plugins
+sample_menus_plugin_auth = Plugin Rust de autenticación
+sample_menus_plugin_cache = Plugin Rust de caché
+
+sample_menus_item_sign_up = Registrarse
+sample_menus_item_login = Iniciar sesión