Fix Site.locale to be editable via backend

Closes #371
Fix: Incorrect location for CroogoHelper::adminTabs();
Clear cache one menu moveUp/Down
Use updateAll() instead of incurring 2 db calls
Activate and redirect user to reset password accordingly

Closes #374
Merge branch '1.5-user-password'
Lost active class in links when locale is specified

Fixed-By: @slightlychilled
Closes #362
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