Hi,
Okay, i just saw the line about the locale, im have seens this problem once before.. it seems to be a deprecated use of the module:
php-intl, which do some translation, and i really never found a fix for that.. Its about the language form, the languages is automatically translated into your native language.. but it does require a ICU library around version 4.4..
If thats the case i havent found the fix yet, if you have the time and skills can you verify what version that is?
if you upload a file containing this:
<?php
phpinfo();
put it in web/info.php
you can see in the section intl which ICU version your host have, its not supported yet if that is below 4.4.