Wallet UI: Improve views (#1763)

* Improve UpdateStore and DerivationScheme views

fix

* Improve wallet views

CSS fix

* Apply suggestions from code review

Co-authored-by: Andrew Camilleri <evilkukka@gmail.com>

BTCPayServer/Models/WalletViewModels/WalletPSBTViewModel.cs

@@ -26,6 +26,7 @@ namespace BTCPayServer.Models.WalletViewModels
                 _FileName = value;
             }
         }
+        [Display(Name = "PSBT content")]
         public string PSBT { get; set; }
         public List<string> Errors { get; set; } = new List<string>();