admin-ui: Fix associations item name overflow

Fix apyrgio/synnefo#248
admin-ui: Minor changes in modal

* X has pointer cursor on hover
* break-word for big emails
admin-ui: Add favicon
admin-ui: prevent refresh page for disabled links
admin-ui: Minor style fixes

* More space in the bottom of the page
* Brighter colored buttons
* Fix apyrgio/synnefo#226
Merge branch 'feature-admin-fixes' into feature-admin