feat(MiniCalendarWidget): enhance localization and refactor calendar logic

- Updated the MiniCalendarWidget to utilize localized strings for month names, weekdays, and loading messages, improving user experience across multiple languages.
- Refactored the calendar logic to use constants for month keys and weekday order, ensuring consistency with backend configurations.
- Added new translation entries for the mini widget in Cebuano, German, English, Spanish, and French, enhancing accessibility for users.

frontend/src/i18n/locales/es/personal.json

@@ -49,6 +49,10 @@
                 "nov": "Noviembre",
                 "dec": "Diciembre"
             },
+            "miniWidget": {
+                "loading": "Cargando calendario…",
+                "linkToCalendar": "Ir al calendario →"
+            },
             "categories": {
                 "personal": "Personal",
                 "work": "Trabajo",

frontend/src/i18n/locales/es/settings.json

@@ -198,9 +198,16 @@
             "linkSignup": "Crear cuenta en OpenAI (nueva pestaña)",
             "linkApiKeys": "Gestionar claves API de OpenAI (nueva pestaña)",
             "enabled": "Permitir uso para funciones de idioma",
+            "presetsTitle": "Inicio rápido (1 clic)",
+            "presetOllama": "Gratis en local (Ollama)",
+            "presetOpenAi": "Predeterminado (compatible con OpenAI)",
+            "presetHintBefore": "El preset de Ollama establece ",
+            "presetHintBetween": " y ",
+            "presetHintAfter": ". No hace falta clave API.",
             "baseUrl": "URL base de la API (opcional)",
             "baseUrlPlaceholder": "Vacío = predeterminado (OpenAI). Para Ollama p. ej. http://127.0.0.1:11434/v1",
             "model": "Nombre del modelo",
+            "modelPlaceholder": "gpt-4o-mini",
             "apiKey": "Clave API",
             "apiKeyHint": "Déjalo vacío para conservar la clave guardada.",
             "apiKeyPlaceholderNew": "Pegar nueva clave",