During creation the new page with utf-8 codepage and non-Latin characters, 
Pressing on either `Save Page` or `Preview` button results in  
> `Error: cannot decode with wide characters at /usr/lib/perl5/vendor_perl/5.16.1/i686-linux/Encode.pm line 215`  

Editing the wiki page with non-Latin characters using webinterface also fails with the same error.  
Additionally, embedding graphviz graphs non-Latin, leads to he same error.
Observed in ikiwiki versions 3.20130904 and version 3.20140102

> This is probably [[fixed|done]] in 3.20140916. Please provide more
> information if not. --[[smcv]]
