Alright, I figured it out. It's a little bit tricky for non-programmers, so here is a manual:
With MediaWiki 1.8.2 it goes like this: 1. CharInsert has to be downloaded from http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/CharInsert/CharIn... Make sure not to download THIS CharInsert.php but to download the CharInsert.php FROM there. 2. Put the CharInsert.php in your extension folder or make a new CharInsert folder in your extension folder and put the php in there. 3. Place require_once("$IP/extensions/CharInsert/CharInsert.php"); or require_once("$IP/extensions/CharInsert.php"); (depending on where you put it) inside LocalSettings.php 4. The corresponding JavaScript code is needed. Normally it's already there, in /common/wikibits.js 5. Copy http://de.wikipedia.org/w/index.php?title=MediaWiki:Edittools&action=edi... into your MediaWiki:Edittools page. Now the chars should already be available on edit pages. 6. Copy http://de.wikipedia.org/w/index.php?title=MediaWiki:Onlyifediting.js&act... into your MediaWiki:Onlyifediting.js page. 7. Copy http://de.wikipedia.org/w/index.php?title=MediaWiki:Monobook.js&action=e... into your MediaWiki:Monobook.js page, maybe not everything, only the very last part concerning Onlyifediting.js. Make sure to get this line right: src="/w/index.php?title=MediaWiki:Onlyifediting.js&action=raw&ctype=text/javascript&dontcountme=s" Instead of /w/ use the name of your wiki folder. 8. Now it should show up on edit pages with the JavaScript scroll list. If not, try refresh.
See also here: http://meta.wikimedia.org/wiki/CharInsert
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