BUG #9722: select ILIKE is not case insensitive in UTF8 cyrillic

The following bug has been logged on the website:

Bug reference: 9722
Logged by: Martin Vassilev
Email address: mv(at)netsurf(dot)bg
PostgreSQL version: 9.3.4
Operating system: Linux Slackware x86_64
Description:

test1=# \d test1
Table "public.test1"
Column | Type | Modifiers
--------+---------+------------------------------------------------------
ID | integer | not null default nextval('"test1_ID_seq"'::regclass)
TEXT | text |

test1=# select * from test1 where "TEXT" ilike 'Тест%';
ID | TEXT
----+---------------
3 | Тестов запис
4 | Тестов запис1
(2 rows)

test1=# select * from test1 where "TEXT" ilike 'тест%';
ID | TEXT
----+------
(0 rows)

Тhese two queries should return the same result.
I don't had that problem in version 8.4.X.
I want to thanks pgsql team for great work on this DB project.

regards,
Martin