Beginning with version 2.0.5 the language packs are no
longer included
with the core distribution.
Language packs can be downloaded from the
TinyMCE website:
http://tinymce.moxiecode.com/download.php
The language
pack codes are based on
ISO-639-1:
http://www.loc.gov/standards/iso639-2/englangn.html
Plrease
try using entities if possible. Like å etc for non a-z
characters.