Improved doc in Webos.Callback.

Translated and completed comments.
Added comments to Webos.Collection.
Added comments
Added comments to Webos.Error.
Added some comments to Webos.File.
Added JSDoc to Webos.File.
Added JSDoc to Webos.inherit().
Update file.js
Improved JSDoc in Webos.File.
Added JSDoc to Webos.Model.
Added JSDoc to Webos.Observable.
Added JSDoc to Webos.Process.
Added JSDoc to /boot/lib/script.js.
Partially added JSDoc to Webos.ServerCall.
Completed JSDoc in Webos.ServerCall.
Updated JSDoc in Webos.ServerCall.

Replaced @return by @returns.
Added JSDoc to Webos.Translation.
Added JSDoc to Webos.UserInterface.
Updated JSDoc in Webos.UserInterface.

Replaced @return by @returns.
Added JSDoc to Webos.LoadImage.