Options menu does not adapt to screen

Fixes #2174

app/view/preferences/Preferences.js

@@ -16,12 +16,15 @@ Ext.define('Rambox.view.preferences.Preferences',{
 
 	,title: locale['preferences[0]']
 	,width: 420
+	,height: 500
 	,modal: true
 	,closable: true
 	,minimizable: false
 	,maximizable: false
 	,draggable: true
 	,resizable: false
+	,scrollable: 'vertical'
+	,bodyStyle: 'margin-right:15px;'
 	,buttons: [
 		{
 			 text: locale['button[1]']