Allow i18n plugin to accept override route configuration
Added basic styles and static route
Added basic styling for the non-content UI
Only provide language links for non-current languages
Save original path in request object in the i18n plugin
Only link tabs if the path is not current
Added icons to toolbar items
link_other accepts extra kwargs
More style tweaks
Fixed link colors in langbar
Basic content CSS
Patch HTML pages to include link to stylesheet
Merge branch 'feature/styling' into develop