Installer can't select language(QTIFW)

hi.

I use qtifw-4.8.1 in linux system.

I want to let the user select a language.

so I modify config.xml 

<Installer>

   <Version>1.1</Version>

  <Name>test</Name>

  <ControlScript>controlscript.qs</ControlScript>

  <Translations>

          <Translation>ifw_ko</Translation>
          <Translation>ifw_ja</Translation>

      .....

    .....

.....

</Installer>

If you look at the settings above Since "<Translations>" can be received in List format, we added Japanese and Korean so that two languages ​​can be used.

and call binarycreator -v -c  config.xml -p packages installer

success instllaer.

And GUI click installer start
However, "ifw_ja" set in "<Translations>" was applied and set to Japanese.

It seems to me that the language written last is applied as the default language and reflected in the installer UI.

Is this a bug?
If this is intentional, what does the list format mean for "<Translations>"?

I will upload a photo for reference.

Thank you.