Add German localization and styling for administration module

- Introduced new JavaScript file `fis.admin_txt_de.js` for German translations of administration-related terms and messages.
- Created `fis.admin.css` for styling the administration interface, including layout, cards, and buttons.
- Added `fis.admin.de.js` for the main functionality of the administration module, implementing features such as system status checks and email testing.
- Minified version of the German JavaScript file created as `fis.admin.de.min.js`.
- Minified CSS file created as `fis.admin.min.css` for optimized loading.

Fuchs/appsettings.Development.json

@@ -30,10 +30,10 @@
       "Enabled": true
     },
     "Email": {
-      "OverrideRecipient": "service@emails.processweb.de"
+      "OverrideRecipient": "info@processweb.de"
     },
     "AzureStorage": {
-      "Enabled": false,
+      "Enabled": true,
       "InvoiceContainer": "dev-fuchs-invoices",
       "ReminderContainer": "dev-fuchs-reminders"
     }