iflng in insert tag

HTML-Code:

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Warum geht:

{{insert_article::mobilemenu-extra-{{iflng::de}}de{{iflng::en}}en{{iflng::sv}}sv{{iflng::pl}}pl{{iflng}}}}

nicht :(

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HTML-Code:

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  {{iflng::de}}{{insert_article::mobilemenu-extra-de}}
  {{iflng::en}}{{insert_article::mobilemenu-extra-en}}
  {{iflng::sv}}{{insert_article::mobilemenu-extra-sv}}
  {{iflng::pl}}{{insert_article::mobilemenu-extra-pl}}
  {{iflng}}

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geht

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1. In welcher Contao Version versuchst du das?
2. Wo genau versuchst du das?