Add translation of tei:surface/@n

Adds a translation of tei:surface/@n in the index views to achieve a consistens German labeling.

Closes #125.

modules/fontane/index-processor.xqm

@@ -547,7 +547,7 @@ element xhtml:li {
                             || "&page=" || $surface
                             || "&target=" || $id
                         },
-                        local:translate-surface($surface),
+                        f-misc:n-translate($surface),
                         if($count eq 1) then ()
                         else (" ", <xhtml:span title="Anzahl an Vorkommnissen auf dieser Seite">({$count})</xhtml:span>)
                     }
@@ -558,35 +558,6 @@ element xhtml:li {
 }
 };
 
-(:~
- : An auxiliary function that translates English tei:surface/@n to their German
- : equivalents. Necessary for having a consistent German labeling in the edition.
- :
- : @author Michelle Weidling
- : @param The current tei:surface/@n/string()
- : @return A translated version of tei:surface/@n/string() where required
- :)
-declare function local:translate-surface($surface as xs:string) as xs:string {
-    switch ($surface)
-        case "outer_front_cover" return "Vorderer Buchdeckel (außen)"
-        case "inner_front_cover" return "Vorderer Buchdeckel (innen)"
-        case "outer_back_cover" return "Hinterer Buchdeckel (außen)"
-        case "inner_back_cover" return "Hinterer Buchdeckel (innen)"
-        case "spine" return "Buchrücken"
-        default return
-            (: e.g. "front_endpaper_Iv" :)
-            if(matches($surface, "endpaper")) then
-                let $page := functx:substring-after-last($surface, "_")
-                let $label := "Vorsatzblatt "
-                return
-                    if(matches($surface, "front")) then
-                        $label || $page
-                    else
-                        "Hinteres " || $label || $page
-            else
-                $surface
-};
-
 (:~
  : prepares a link to the current entry
  : @param $id The xml:id of the currently processed element