[imp] "String contains non-ASCII characters" after Upgrading Ubuntu-Server (12.04 > 14.04)

[Karsten Schlimme]

Hi everybody,

my Horde Groupware 5.2.1 is installed on an Ubuntu Server which I  
upgraded from 12.04 to 14.04.

After this the Apache webserver didn't start because of two errors:  
Missing httpd.conf and Invalid command 'LockFile'.

I fixed both errors with the following solutions:
http://serverfault.com/questions/500803/etc-apache2-httpd-conf-no-such-file-or-directory-error-after-ubuntu-upgrade
http://askubuntu.com/questions/368515/upgraded-to-ubuntu-13-10-apache-not-able-to-start

After that I got a problem that is horde related I think and I can't  
find anything on the web. Apache is started now and I'm able to browse  
to the login page. If I try to login I get a white page that shows me  
"Fatal error - String contains non-ASCII characters" with much code  
after that. If I go to the address bar and delete  
"/dynamic.php?page=mailbox" from  
"https://webmail.mydomain.net/imp/dynamic.php?page=mailbox" I get into  
Horde Groupware and I'm able to browse everything except two of my  
mail directories: INBOX and DRAFTS. They are shown as empty and  
everytime I click on refresh I get the error "String contains  
non-ASCII characters" in a red box in the lower right corner.

Does anybody know how to fix this error?

Many thanks in advance for your help :)

Best regards,

Karsten
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