Fix wrong path on theme screenshot

Closes #383

Signed-off-by: Rachman Chavik <rchavik@xintesa.com>
Display current theme screen shot and simplify code
Deprecate admin_dashboard()
Upgrade submodule croogo/locale@c493f78eae4e7d46
Updating AUTHORS.txt for release 1.5.7
Updating VERSION.txt for release 1.5.7
Merge branch 'master' into 2.0

Conflicts:
	Locale
	VERSION.txt