chore(pdf): add apc-ident to pdf metadata

templates/letter/din5008.latex

@@ -26,11 +26,17 @@ $endif$
 $if(lang)$
   pdflang={$lang$},
 $endif$
-$if(subject)$
-  pdfsubject={$subject$},
+$if(is-de)$
+  $if(de-subject)$
+    pdfsubject={$de-subject$},
+  $endif$
+$else$
+  $if(en-subject)$
+    pdfsubject={$en-subject$},
+  $endif$
 $endif$
-$if(keywords)$
-  pdfkeywords={$for(keywords)$$keywords$$sep$, $endfor$},
+$if(apc-ident)$
+  pdfkeywords={$apc-ident$},
 $endif$
 }
 \usepackage{url}

templates/letter/din5008with_pin.latex

@@ -17,7 +17,7 @@
 \IfFileExists{xurl.sty}{\usepackage{xurl}}{} % add URL line breaks if available
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
 \hypersetup{
-$if(title-meta)$
+  $if(title-meta)$
   pdftitle={$title-meta$},
 $endif$
 $if(author-meta)$
@@ -26,11 +26,17 @@ $endif$
 $if(lang)$
   pdflang={$lang$},
 $endif$
-$if(subject)$
-  pdfsubject={$subject$},
+$if(is-de)$
+  $if(de-subject)$
+    pdfsubject={$de-subject$},
+  $endif$
+$else$
+  $if(en-subject)$
+    pdfsubject={$en-subject$},
+  $endif$
 $endif$
-$if(keywords)$
-  pdfkeywords={$for(keywords)$$keywords$$sep$, $endfor$},
+$if(apc-ident)$
+  pdfkeywords={$apc-ident$},
 $endif$
 }
 \usepackage{url}