Add support for the fx property files: *.fxproperties

For Example:
------------  Main_sp.fxproperties  ---------
"Text"="áéíúó"
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------------  Main.fx  ---------
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.text.*;

import java.util.Locale;

Locale.setDefault(new Locale("sp"));

Stage {
    title: "Localization Text"
    width: 200
    height: 200
    scene: Scene {
        content: Text {
            x:  50 y: 50
            font: Font {  size: 24 }
            content: "áéíúó"
        }
    }
}
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