If-Condition to vary Citation Style

Hey there,

i know  that it is possible with CSL to tell my citation program that if a condition applies, it uses another form of citation. It would be very nice if i could do the same in a citation style in Endnote.

E.G. to split the citation with a language-condition: When Language is English, do this citation:

Berg et al. (2001): ABC. In: J. Chapman (ed.): DEF.

and in German Language:

Berg u.a. (2001): ABC. In: J. Chapman (Hg.): DEF.

May it is possible to citate like this?

Thanks for your help,