[Translation] String _Use %FORMATNAME Format

Where can I find %FORMATNAME for Save dialog box when you open .txt file with LO and then when you save you get to choose do you want to save in ODF or, for example, text:

_Use %FORMATNAME Format

Context: alienwarndialog.ui save label string.text

Locations: alienwarndialog.ui <https://translations.documentfoundation.org/projects/libo_ui/translate/sfx2/uiconfig/ui.po#search=alienwarndialog.ui&sfields=locations>

I see we have translated %FORMATNAME (it's "tekst" not "text") but I can't find string "text" which %FORMATNAME is referring to.

Can somebody help me?