[#20288] Add a note about case-insensitivity of CodeRay language names/aliases.

Regarding the i18n: I used English as the base language. The
changed sentence was the same in 93 out of 98 language files,
public\help\xx[-xx]\wiki_syntax_detailed_[markdown||textile].html.

The only five exceptions were:

* cs; public\help\cs\wiki_syntax_detailed_textile.html
* fr; public\help\fr\wiki_syntax_detailed_textile.html
* ja; public\help\ja\wiki_syntax_detailed_textile.html
* ru; public\help\ru\qiki_syntax_detailed_textile.html
* zh-tw; public\help\zh-tw\wiki_syntax_detailed_textile.html

In the above given files, the changed sentence is translated. I
have replaced the whole translated sentence with the new English
base sentence, as such leaving new translations up to translators.

Contributed by Mischa The Evil.

git-svn-id: http://svn.redmine.org/redmine/trunk@14490 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/help/lt/wiki_syntax_detailed_textile.html

@@ -308,7 +308,7 @@ It can be expanded by clicking a link.
 
     <p>Default code highlightment relies on <a href="http://coderay.rubychan.de/" class="external">CodeRay</a>, a fast syntax highlighting library written completely in Ruby. It currently supports c, clojure, cpp (c++, cplusplus), css, delphi (pascal), diff (patch), erb (eruby, rhtml), go, groovy, haml, html (xhtml), java, javascript (ecmascript, ecma_script, java_script, js), json, lua, php, python, ruby (irb), sass, sql, taskpaper, text (plain, plaintext), xml and yaml (yml) languages, where the names inside parentheses are aliases.</p>
 
-    <p>You can highlight code in your wiki page using this syntax:</p>
+    <p>You can highlight code in your wiki page using this syntax (note that the language name or alias is case-insensitive):</p>
 
 <pre>
 &lt;pre&gt;&lt;code class="ruby"&gt;