refactor: migrate i18n files from YAML to TOML format and simplify structure (#1230)

* refactor: migrate i18n files from YAML to TOML format and simplify structure

* refactor: make translation file adjust to gohugoio/locales language code so date translation can work properly

* refactor: use hyphens instead of underscores for i18n, because that's how Hugo pick the translation file

* docs: update comments for i18n language availability and CJK language detection in hugo.toml.

i18n/es.toml

@@ -0,0 +1,47 @@
+toggleMenu = "Ocultar menú"
+darkMode   = "Modo oscuro"
+
+[list]
+    section = "Sección"
+
+    [list.page]
+        one   = "{{ .Count }} página"
+        other = "{{ .Count }} páginas"
+
+    [list.subsection]
+        one   = "Subsección"
+        other = "Subsecciones"
+
+[article]
+    back            = "Volver"
+    tableOfContents = "Tabla de contenido"
+    relatedContent  = "Contenidos relacionados"
+    lastUpdatedOn   = "Última actualización"
+
+    [article.readingTime]
+        one   = "Tiempo de lectura {{ .Count }} minuto"
+        other = "Tiempo de lectura {{ .Count }} minutos"
+
+[notFound]
+    title    = "No Encontrado"
+    subtitle = "Esta página no existe"
+
+[widget]
+    [widget.archives]
+        title = "Archivo"
+        more  = "Más"
+
+    [widget.tagCloud]
+        title = "Etiquetas"
+
+    [widget.categoriesCloud]
+        title = "Categorías"
+
+[search]
+    title       = "Búsqueda"
+    placeholder = "Escribe algo..."
+    resultTitle = "#PAGES_COUNT páginas en (#TIME_SECONDS segundos)"
+
+[footer]
+    builtWith  = "Creado con {{ .Generator }}"
+    designedBy = "Tema {{ .Theme }} diseñado por {{ .DesignedBy }}"