Fixed: Set output encoding to UTF-8 when running external processes

(cherry picked from commit f8e57b09856278a6d0c65f18704e96a33459687d)

src/NzbDrone.Common/Processes/ProcessProvider.cs

@@ -6,6 +6,7 @@ using System.ComponentModel;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Text;
 using NLog;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Model;
@@ -117,7 +118,9 @@ namespace NzbDrone.Common.Processes
                 UseShellExecute = false,
                 RedirectStandardError = true,
                 RedirectStandardOutput = true,
-                RedirectStandardInput = true
+                RedirectStandardInput = true,
+                StandardOutputEncoding = Encoding.UTF8,
+                StandardErrorEncoding = Encoding.UTF8
             };
 
             if (environmentVariables != null)