Fix Apt update detection on non-English locales

Author: GabrielDuf

src/UniGetUI.PackageEngine.Managers.Apt/Apt.cs

@@ -223,6 +223,8 @@ protected override IReadOnlyList<Package> GetAvailableUpdates_UnSafe()
                 CreateNoWindow = true,
             },
         };
+        p.StartInfo.EnvironmentVariables["LANG"] = "C";
+        p.StartInfo.EnvironmentVariables["LC_ALL"] = "C";
         IProcessTaskLogger logger = TaskLogger.CreateNew(LoggableTaskType.ListUpdates, p);
         p.Start();