[Jux] Added edit icons to menu items in frontend, improved modules edit icons, and fixed admin toolbar edit icon transition effect

This pull request adds hover edit icons to menu items in front-end, with link to directly edit the menu item in the admin area.

It also:
- adds to the transitions the "Duplicate" toolbar menu button of modules
- copies to backend lib language file (makes them identical with front-end)
- fix "Edit" toolbar menu button transition
 that got forgotten in the previous commit

An image being worth 1000 words:

![frontend-menu-edit-icon](https://f.cloud.github.com/assets/47402/792983/0fe2a036-ebd5-11e2-8e21-4d19ed4f546b.png)

As with modules edit, this requires good testing, including when editing multiple items at same time that all save correctly.