GF cloud: work on syntax editor integration

+ The syntax editor is now accessible from the Simple Translaton Tool.
+ The minibar now automatically provides access to the syntax editor (provided
  the necessary JavaScript files and style sheets have been loaded).
+ Preparations for making the syntax editor accessible from the grammar editor.

src/www/gfse/editor.css

@@ -129,7 +129,7 @@ textarea.text_mode {
     width: 99%;
 }
 
-div#minibar {
+div#minibar, div#syntax_editor {
     border: 1px solid black;
     padding: 5px;
     background: #ccc url("../minibar/brushed-metal.png");