Fix #124 according to the snippet by @mrvdb

I changed the sh alias to shell instead of bash.

The additions to the `highlight(nodes)` function look redundant.
It works for me without them but maybe they cover an edge case I
cannot think about?

templates/include/post-render.tmpl

@@ -9,6 +9,22 @@
     // Set langs to the langs that are included by default (for now: 'common set' on CDN)
     var langs = [];
 
+    // Custom aliasmap
+    var aliasmap = {
+      "elisp"      : "lisp",
+      "emacs-lisp" : "lisp",
+      "c"          : "cpp",
+      "cc"         : "cpp",
+      "h"          : "cpp",
+      "c++"        : "cpp",
+      "h++"        : "cpp",
+      "hpp"        : "cpp",
+      "hh"         : "cpp",
+      "hxx"        : "cpp",
+      "cxx"        : "cpp",
+      "sh"         : "shell"
+    };
+    
     // Given a set of nodes, run highlighting on them
     function highlight(nodes) {
       for (i=0; i < nodes.length; i++) {
@@ -46,6 +62,8 @@
       // Check what we need to load
       for (i=0; i < lb.length; i++) {
         lang = lb[i].className.replace('language-','');
+        // Support the aliases specified above
+        if (aliasmap[lang]) lang = aliasmap[lang];
         lurl = hlbaseUri + "highlightjs/" + lang + ".min.js";
         if (!(langs.includes(lang) || jss.includes(lurl))) {
           jss.push(lurl);