Use prepend_before_filter instead of append_before_filter

[paolodona]

This change allows other filter to find the locale set correctly and use it (eg: for redirection).

this is useful when we cannot specify the order of the filters (eg: filters are loaded by gems)

In my particular case, I'm using resources controller (rc_rails), which adds a filter that doesn't find the locale set.

Paolo

[mateomurphy]

Unless I'm mistaken, the problem with doing this is that if your current_user is set by another filter, you won't have access to it to set the user_locale, so I don't think prepending is the right solution either. I'm going to have to think about it.

Incidentally, this is why I add the automatically_detect config option, as I figured some people would need finer grained control over loading