Display the last update check time on the reload button

Display the last update check time on the reload button of the Software
Updates section. The time is displayed when after the update check is
completed.

#4604

Author: sduquette-devolutions

src/UniGetUI/Pages/SoftwarePages/AbstractPackagesPage.xaml.cs

@@ -527,6 +527,10 @@ private void Loader_FinishedLoading(object? sender, EventArgs e)
             LoadingProgressBar.Visibility = Visibility.Collapsed;
             // Required to update UI labels
             LastPackageLoadTime = DateTime.Now;
+            ToolTipService.SetToolTip(
+                ReloadButton,
+                CoreTools.Translate("Last checked: {0}", LastPackageLoadTime.ToString(CultureInfo.CurrentCulture))
+            );
             UpdatePackageCount();
             WhenPackagesLoaded(ReloadReason.External);
         }