Convert SysTray to use JPopupMenu for Unicode support

Correct Systray_zh.properties to ISO 8859-1 instead of UTF-8.

Added SysTray test to GuiTests

src/test/java/org/qora/test/GuiTests.java

@@ -2,6 +2,7 @@ package org.qora.test;
 
 import org.junit.Test;
 import org.qora.gui.SplashFrame;
+import org.qora.gui.SysTray;
 
 public class GuiTests {
 
@@ -14,4 +15,13 @@ public class GuiTests {
 		splashFrame.dispose();
 	}
 
+	@Test
+	public void testSysTray() throws InterruptedException {
+		SysTray.getInstance();
+
+		while(true) {
+			Thread.sleep(2000L);
+		}
+	}
+
 }