Add SupportedCultures and DB connection to appsettings.json

Added "SupportedCultures" for localization support and a "ConnectionStrings" section with a default SQL Server connection string. Also reformatted "AllowedHosts" for consistency.

EnvelopeGenerator.ServiceHost/appsettings.json

@@ -8,5 +8,9 @@
   "Worker": {
     "DelayMilliseconds": 1000
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "SupportedCultures": [ "de-DE", "en-US" ],
+  "ConnectionStrings": {
+    "Default": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
+  }
 }