CKEditor4.5.7發布，可視化HTML編輯器_html/css

#14327 : Added Swiss German localization.

#13816 : Introduced a new strategy for Filling Character handling to avoid changes in DOM. This fixes the following issues:

#12727 : [Blink] IndexSizeError when using the Div Editing Area and Content Templates plugins.

#13377 : Widget plugin issue when typing in Korean.

#13389 : [Blink] editor.getData() fails when the cursor is next to an

#13513 : [Blink, WebKit] Div Editing Area and editor.getData() throw an error when an image is the only data in the editor.

#13884 : Fixed: Copy/paste table in Firefox results in just first cell being pasted.

#14234 : Fixed: URL input field is not marked as required in the Embed dialog.