quick fixes #1437 - setlocale(LC_CTYPE, '') so strtolower(), strtoupper(), ucfirst(), and ucwords() aren't affected by locale

In the future, we might consider implementing a thread-safe alternative to using setlocale() given this warning:

> The locale information is maintained per process, not per thread. If you are running PHP on a multithreaded server API like IIS or Apache on Windows, you may experience sudden changes in locale settings while a script is running, though the script itself never called setlocale(). This happens due to other scripts running in different threads of the same process at the same time, changing the process-wide locale using setlocale().

Reference:  http://php.net/setlocale


git-svn-id: http://dev.piwik.org/svn/trunk@2327 59fd770c-687e-43c8-a1e3-f5a4ff64c105