Use Arial unicode as embedded font

gui/src/main/java/io/bitsquare/app/BitsquareApp.java

@@ -55,6 +55,7 @@ import javafx.scene.input.KeyCombination;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.layout.Pane;
 import javafx.scene.layout.StackPane;
+import javafx.scene.text.Font;
 import javafx.stage.Modality;
 import javafx.stage.Stage;
 import javafx.stage.StageStyle;
@@ -162,13 +163,15 @@ public class BitsquareApp extends Application {
                     mainView.setPersistedFilesCorrupted(corruptedDatabaseFiles);
             });*/
 
+            Font.loadFont(getClass().getResource("/fonts/Arial Unicode.ttf").toExternalForm(), 13);
+            
             scene = new Scene(mainView.getRoot(), 1190, 740);
             scene.getStylesheets().setAll(
                     "/io/bitsquare/gui/bitsquare.css",
                     "/io/bitsquare/gui/images.css");
 
             // configure the system tray
-            SystemTray systemTray = SystemTray.create(primaryStage, shutDownHandler);
+            SystemTray.create(primaryStage, shutDownHandler);
 
             primaryStage.setOnCloseRequest(event -> {
                 event.consume();

gui/src/main/java/io/bitsquare/gui/bitsquare.css

@@ -78,6 +78,7 @@ bg color of non edit textFields: fafafa
     -fx-selection-bar: derive(-fx-accent, 50%);
 
     -fx-font-size: 13;
+    -fx-font-family: "Arial Unicode";
 }
 
 #splash {
@@ -213,7 +214,6 @@ bg color of non edit textFields: fafafa
     -fx-cursor: hand;
 }
 
-
 /*******************************************************************************
  *                                                                             *
  * Tooltip                                                                     *
@@ -470,7 +470,6 @@ textfield */
     -fx-font-size: 12;
 }
 
-
 /* Create offer */
 #direction-icon-label {
     -fx-font-weight: bold;
@@ -1040,7 +1039,6 @@ textfield */
     -fx-text-fill: #333;
 }
 
-
 .popup-icon-information {
     -fx-text-fill: #ddd;
 }