organize highlight js style options

lib/routes/admin.js

@@ -131,16 +131,16 @@ module.exports = function(crowi, app) {
     settingForm = Config.setupCofigFormData('crowi', req.config);
 
     const highlightJsCssSelectorOptions = {
-      "atom-one-dark": 'Atom One Dark',
-      "atom-one-light": 'Atom One Light',
-      "github-gist": 'Github Gist',
-      "github": 'Github',
-      "hybrid": 'Hybrid',
-      "monokai": 'Monokai',
-      "tomorrow-night": 'Tomorrow Night',
-      "vs": 'Vs',
-      "vs2015": 'Vs 2015',
-      "xcode": 'Xcode'
+      "github": '[Light] Github',
+      "github-gist": '[Light] Github Gist',
+      "atom-one-light": '[Light] Atom One Light',
+      "xcode": '[Light] Xcode',
+      "vs": '[Light] Vs',
+      "atom-one-dark": '[Dark] Atom One Dark',
+      "hybrid": '[Dark] Hybrid',
+      "monokai": '[Dark] Monokai',
+      "tomorrow-night": '[Dark] Tomorrow Night',
+      "vs2015": '[Dark] Vs 2015',
     }
 
     return res.render('admin/customize', {