Set locale properly in Apache configuration

Set locale properly in Apache configuration

A RewriteCond only applies to the next RewriteRule, while our config was
attempting to apply multiple rules for a single condition. Fix that up
by using skip (S) rules to apply blocks of rules for the condition in
question.

Also, use the HTTP:Accept-Language value directly, rather than relying
on a backreference (which did not seem to be working as desired).

These fixes enable screens like the Register Patron interface to present
field labels from the IDL in the correct locale, whereas previously they
would always default to en-US.

Signed-off-by: Dan Scott <dscott@laurentian.ca>