feat(ui): improve submodule rendering

rhodecode/templates/files/files_browser_tree.mako

@@ -100,7 +100,11 b' http://docker-dev:10020/ipython/files/ma'
 
                 ## submodule if we somehow endup
                 % if c.file.is_submodule():
-                    <span class="submodule-dir">Submodule ${h.escape(c.file.name)}</span>
+                    <span class="submodule-dir">
+                        <strong>Submodule Node</strong><br/>
+                        ${h.escape(c.file.name)}
+                        <pre>${c.file.url}</pre>
+                    </span>
                 %endif
             </td>
         </tr>