[imp] php 5.1.1 and problems with german-umlaute

[Martin Luethi]

> since my update from php 5.0.5 to 5.1.1 I have problems with the german
> umlaute (äüö). the umlaute in imp/mailbox.php are all ok. but when I read a
> message (imp/message.php) some messages show the umlaute in utf-8 (e.g. ü ->
> ü).

after deleting all files in my horde cache directory the problem seems to
be gone

tinu