\directlua{includeCode("text/spelling")}
\newcommand{\loadDictionary}[1]{\directlua{spellChecker.loadDictionary([[#1]])}}
\def\@SpellCheckerFlag{false}
\def\enableSpellChecker{\def\@SpellCheckerFlag{true}}
\def\disableSpellChecker{\def\@SpellCheckerFlag{false}}
\newcommand{\spellCheck}[2][de/common]
{%
  \ifthenelse{\equal{\@SpellCheckerFlag}{true}}%
    {\expandafter\directlua{spellChecker.check([[#1]], [[\detokenize{#2}]])}}%
    {#2}%
}

\newcommand{\correct}[1]{\ifthenelse{\equal{\@SpellCheckerFlag}{true}}{\PDFmarkupComment{Marked as Correct}{#1}{Correct}{green}}{#1}}