github_plugin.cpp: in error message relative to"cannot get zip archive...", line 496, make the sentence relative to http GET command not translatable

inside the full translated message.

pcbnew/github/github_plugin.cpp

@@ -493,9 +493,11 @@ void GITHUB_PLUGIN::remote_get_zip( const wxString& aRepoURL ) throw( IO_ERROR )
     catch( boost::system::system_error& e )
     {
         // https "GET" has faild, report this to API caller.
-        wxString fmt( _( "Cannot get/download Zip archive: '%s'\nfor library path: '%s'.\nReason: '%s'" ) );
+        wxString errorcmd( wxT("https GET command failed") ); // Do not translate this message
+        wxString fmt( _( "%s\nCannot get/download Zip archive: '%s'\nfor library path: '%s'.\nReason: '%s'" ) );
 
         string msg = StrPrintf( TO_UTF8( fmt ),
+                TO_UTF8( errorcmd ),
                 zip_url.c_str(),
                 TO_UTF8( aRepoURL ),
                 e.what() );