Ability to set composer default font (#287)

* Added ability to set Composer font

* Added missing translations and refactoring

* Remove unused methods

* Small fixes

Wino.Mail/Views/Settings/ReadComposePanePage.xaml.cs

@@ -0,0 +1,12 @@
+using Wino.Views.Abstract;
+
+namespace Wino.Views.Settings
+{
+    public sealed partial class ReadComposePanePage : ReadComposePanePageAbstract
+    {
+        public ReadComposePanePage()
+        {
+            InitializeComponent();
+        }
+    }
+}