Language Switcher UI component: please always use a drop down similar to the one in the toolbar in all concerned engines

Could we have one single version of the language switcher UI component? Currently we have a flat version in the File manager (for instance) and a drop-down menu in the toolbar. In order to gain room, I think we could only keep one single dorp-down language switcher component.

If we extend it to manage more options (similar to the language switcher tag which can display a lot more options - cf TCK template about it), the webmaster should then have a way to decide how he wants to display the languages "flags" (flat list vs drop-down, with or without flags, etc...).

For the beta, let's try to unify everything under a single drop-down menu with flags. And let's ensure (check with Régis) if we have flags for the most frequently used languages (or at least the 6 languages we officially support aka EN, DE, FR, P, I, ES)