Locale fr doesn't work for several month. Form field returned is blank

[GoogleCodeExporter]

What steps will reproduce the problem?
1. <%= calendar_date_select_includes "blue", :locale=>'fr'%>
2. <%= f.calendar_date_select :date, :year_range => 5.years.ago..0.years.ago %>
3. Select a month where the 3 first letters aren't the same in english and
in french
example :
Janvier -> january -> jan = jan => OK
Février -> february -> fév <> feb => KO
mars -> march -> mar = mar => OK
avril -> april -> avr <> apr => KO
mai -> may -> mai <> may => KO
juin -> june -> jui <> jun => KO
juillet -> july ->  jui <> jul => KO
Aout -> August -> aou <> aug => KO
septembre -> september -> sep = sep => OK
octobre -> october -> oct = oct => OK
décembre - december -> déc <> dec => KO

it doesn't depend on the year selected

What is the expected output? What do you see instead?
I expect the selected date but i receive NULL

What version of the product are you using? On what operating system?

Please provide any additional information below.

Original issue reported on code.google.com by rdelv...@gmail.com on 7 Apr 2009 at 12:24

[GoogleCodeExporter]

Locale it also is blank for several months. 
Couldn't find any pattern though.

Original comment by sara.amb...@googlemail.com on 23 Apr 2009 at 4:25