translations for gsk tooltip
added gsk model class and mako
Use 301 redirection instead of 302 for SEO
Merge pull request #1024 from geoadmin/gal_redirect_movepermanently

Use 301 redirection instead of 302 for SEO
Merge pull request #1021 from geoadmin/data_gsk_tooltip

Data gsk tooltip
added deploy to demo instance mechanic
added branch deploy to demo
updated doc with demo instance