crille

Non-ASCII characters can be used in the URL, but they have to be encoded (RFC3986). URL encoding is widely used (e.g. Wikipedia http://ja.wikipedia.org/wiki/Wikipedia:%E9%80%A3%E7%B5%A1%E5%85%88). 
This plugin encodes NON-ASCII characters in the slugs of your pretty permalinks. So your slugs may look like <code>fußball-in-nürnberg</code> or <code>連絡先</code>.

Permalink Encoding

This plugin encodes NON-ASCII characters in pretty permalinks by using Percent-Encoding described in RFC3986.

Takashi Kitajima

MW Theme URI Shortcode to make a shortcord outputting theme directory uri. 
shortcode : [template_directory_uri], [stylesheet_directory_uri]
When you switches Visual to Text, replaced into shortcode. 
When you switches Text to Visual, shortcode replaced into theme uri. 
IF you don’t use child theme, there are cases where [stylesheet_directory_uri] replaces [template_directory_uri]

MW Theme URI Shortcode

MW Theme URI Shortcode to make a shortcord outputting theme directory uri.

Permalink Encoding vs MW Theme URI Shortcode