regression: filter instance activity by instance

regression from 6693c29
fix query_param encoding
fix key error in buildout (by joka)
allow to define heading color individually
tweak text
pin versions
typo
rm missing static links

We can not guarrantee that these pages will be available in
every static pages backend.
update sass and compass to latest versions
use compass flexbox mixins
clean up openid template
sso warning
update ssh warning text and add button
update sseo warning CSS
static page on instance overview
clearify instance static_overview_path comment
Merge pull request #814 from xi/feature-static-instance-overview

static page on instance overview
Merge pull request #813 from xi/feature-984-velruse-ui+3

single sign-on warning
i18n
Use proper permission check for edit category button

Fixup 545c9ec084a47ed5dd3a96799728e0db3aac9eec from PR #805