Added needed i18n strings for element, scene and project widgets.
Created ElementButton and SceneButton, small javadoc improvement for ProjectButton.
Since there is no title/description for the Scenes and SceneElements some alternative message will be displayed instead, for those widgets.
More javadoc and improvements for DescriptionCard and GalleryEntity widgets.
Added shorting functionality to all galleries.
The Newest/Oldest shorting options doesn't do anything because there are no modification dates for the gallery entities at the moment.
Merge pull request #104 from RotaruDan/ProjectGalleryFunctionality

Shorting gallery functionality and more...