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/de/personal.json

@@ -49,6 +49,10 @@
                 "nov": "November",
                 "dec": "Dezember"
             },
+            "miniWidget": {
+                "loading": "Kalender wird geladen…",
+                "linkToCalendar": "Zum Kalender →"
+            },
             "categories": {
                 "personal": "Persönlich",
                 "work": "Arbeit",

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

@@ -198,9 +198,16 @@
             "linkSignup": "Konto bei OpenAI anlegen (neues Fenster)",
             "linkApiKeys": "API-Keys bei OpenAI verwalten (neues Fenster)",
             "enabled": "Nutzung für Sprachfunktionen erlauben",
+            "presetsTitle": "Schnellstart (1-Klick)",
+            "presetOllama": "Kostenlos lokal (Ollama)",
+            "presetOpenAi": "Standard (OpenAI-kompatibel)",
+            "presetHintBefore": "Der Ollama-Preset setzt ",
+            "presetHintBetween": " und ",
+            "presetHintAfter": ". Kein API-Key erforderlich.",
             "baseUrl": "API-Basis-URL (optional)",
             "baseUrlPlaceholder": "Leer = Standard (OpenAI). Für Ollama z. B. http://127.0.0.1:11434/v1",
             "model": "Modellname",
+            "modelPlaceholder": "gpt-4o-mini",
             "apiKey": "API-Schlüssel",
             "apiKeyHint": "Leer lassen, um den gespeicherten Schlüssel beizubehalten.",
             "apiKeyPlaceholderNew": "Neuen Schlüssel einfügen",