I18n.locale = --> setting this is ignored

gistfile1.txt

From: /home/rca/work/code/ror/leihs/app/controllers/application_controller.rb @ line 65 ApplicationController#set_gettext_locale:

    60:         current_user.language = language # language is a protected attribute, it can't be mass-asigned via update_attributes
    61:         current_user.save
    62:         current_user.reload
    63:       end
    64:       locale_symbol = current_user.language.locale_name.to_sym
 => 65:       binding.pry
    66:     else
    67:       locale_symbol = Language.default_language.locale_name.to_sym
    68:     end
    69:     
    70:     I18n.locale = locale_symbol

[1] pry(#<Backend::InventoryPoolsController>)> locale_symbol
=> :"de-CH"
[2] pry(#<Backend::InventoryPoolsController>)> I18n.locale
=> :en_GB
[3] pry(#<Backend::InventoryPoolsController>)> I18n.locale = locale_symbol

From: /home/rca/.rvm/gems/ruby-1.9.2-p320/gems/fast_gettext-0.6.6/lib/fast_gettext/storage.rb @ line 187 FastGettext::Storage#format_locale:

    187:     def format_locale(locale)
    188:       #locale.sub(/^([a-zA-Z]{2})[-_]([a-zA-Z]{2})$/){$1.downcase+'_'+$2.upcase}
    189:     
    190:       #locale.sub(/^([a-zA-Z]{2})([-_])([a-zA-Z]{2})$/){$1.downcase+'$2'+$3.upcase}
    191: 
 => 192: 	binding.pry
    193:       locale.sub(/^([a-zA-Z]{2})[-_]([a-zA-Z]{2})$/){$1.downcase+'-'+$2.upcase}
    194:     end

[1] pry(FastGettext)> locale.sub(/^([a-zA-Z]{2})[-_]([a-zA-Z]{2})$/){$1.downcase+'-'+$2.upcase}
=> "de-CH"
[2] pry(FastGettext)> exit
=> :"de-CH"
[4] pry(#<Backend::InventoryPoolsController>)> I18n.locale
=> :en_GB
[5] pry(#<Backend::InventoryPoolsController>)>