Some fixes

- duplicate of save buttons
- materials + styles in alphabet order
- brands order in admin
- category - required field
- view on site
updated materials field
Merge branch 'refs/heads/feature-admin' into develop
updated text in 3dmodel field
Merge branch 'refs/heads/feature-3dmodel-text' into develop
updated
Merge branch 'refs/heads/feature-howtoorder-markup' into develop
fixed
Merge branch 'refs/heads/feature-about-text' into develop