DeclareDatamodelFields[type=field, datatype=literal]{alternatetitle}
DeclareDatamodelFields[type=field, datatype=literal]{alternatetitlescript}
DeclareDatamodelEntryfields[movie,misc,video]{alternatetitle, alternatetitlescript}

RequirePackage{filecontents} begin{filecontents}{jobname.bib}
  @movie{themovie,
        Address = {USA},
        Alternatetitle = {Аэлита},
        Alternatetitlescript = {cyrillic},
        Director = {Mad, Max},
        Title = {The Title},
        Year = {1996}}
end{filecontents}
documentclass{article}
usepackage[style=fiwi]{biblatex}
usepackage{ragged2e}
renewbibmacro*{filmtitle}{iffieldundef{maintitle}
  {printtext{printfield[film]{title}}}
  {printfield[film]{maintitle}newunit}%
iffieldundef{alternatetitle}
  {}
  {usebibmacro{bbx:cite-alternatetitle}}
iffieldundef{subtitle}%
  {}%
  {setunit{}%
printtext{addspaceprintfield{subtitle}}}%
iffieldundef{volume}%
  {}%
  {printfield[season]{volume}}%
iffieldundef{number}%
  {}%
  {addcommaaddspaceprintfield[episode]{number}}%
iffieldundef{maintitle}%
  {}%
  {addcolonaddspaceprintfield[film]{title}}%
ifpunctmark{!}{unspace.newunit}{adddot}}%

newbibmacro*{bbx:cite-alternatetitle}{
iffieldundef{alternatetitlescript}
  {addslashprintfield{alternatetitle}}
  {addslashifbibmacroundef{altscript:strfield{alternatetitlescript}-font}
  {textsc{thefield{alternatetitle}}}{usebibmacro{altscript:strfield{alternatetitlescript}-font}%
    {thefield{alternatetitle}}} }}

addbibresource{jobname.bib}
usepackage{fontspec}
setmainfont{TeX Gyre Pagella}
newbibmacro*{altscript:cyrillic-font}[1]{newfontfamilycyrfont[Extension = .ttf,]{Linux Libertine}{cyrfont{textsc{#1}}}}

begin{document}
citefilm{themovie}
printbibliography
end{document}

usebibmacro*{altscript:strfield{alternatetitlescript}-font}{thefield{alterna‌​tetitle}}