refine error message

shadowsocks-csharp/Controller/SystemProxy.cs

@@ -48,10 +48,11 @@ namespace Shadowsocks.Controller
                 //Must Notify IE first, or the connections do not chanage
                 CopyProxySettingFromLan();
             }
-            catch (Exception)
+            catch (Exception e)
             {
-                MessageBox.Show("can not change registry!");
-                throw;
+                Logging.LogUsefulException(e);
+                // TODO this should be moved into views
+                MessageBox.Show(I18N.GetString("Failed to update registry"));
             }
         }
 
@@ -68,10 +69,11 @@ namespace Shadowsocks.Controller
                 SystemProxy.NotifyIE();
                 CopyProxySettingFromLan();
             }
-            catch (Exception)
+            catch (Exception e)
             {
-                MessageBox.Show("can not change registry!");
-                throw;
+                Logging.LogUsefulException(e);
+                // TODO this should be moved into views
+                MessageBox.Show(I18N.GetString("Failed to update registry"));
             }
         }
 

shadowsocks-csharp/Data/cn.txt

@@ -43,5 +43,6 @@ Disabled=已禁用代理
 Update PAC from GFWList=从 GFWList 更新 PAC
 Failed to update PAC file =更新 PAC 文件失败
 PAC updated=更新 PAC 成功
-"Failed to find QRCode=无法找到二维码
+No QRCode found. Try to zoom in or move it to the center of the screen.=找不到二维码，尝试把它放大或者移动到靠近屏幕中间的位置
 Failed to decode QRCode=无法解析二维码
+Failed to update registry=无法修改注册表

shadowsocks-csharp/View/MenuViewController.cs

@@ -435,7 +435,7 @@ namespace Shadowsocks.View
                     }
                 }
             }
-            MessageBox.Show(I18N.GetString("Failed to find QRCode"));
+            MessageBox.Show(I18N.GetString("No QRCode found. Try to zoom in or move it to the center of the screen."));
         }
 
         void splash_FormClosed(object sender, FormClosedEventArgs e)
@@ -451,7 +451,7 @@ namespace Shadowsocks.View
 		private void AutoStartupItem_Click(object sender, EventArgs e) {
 			AutoStartupItem.Checked = !AutoStartupItem.Checked;
 			if (!AutoStartup.Set(AutoStartupItem.Checked)) {
-				MessageBox.Show("Failed to edit registry");
+				MessageBox.Show(I18N.GetString("Failed to update registry"));
 			}
 		}
     }