Merge branch 'release/3.3.5'

Add `en` default text to `site.locale` strings
- Close #407

Merge branch 'release/3.0.0'

Merge branch 'feature/documentation-and-demo' into develop

Fix broken breadcrumb links by including base_path helper

Move breadcrumb text out of _config.yml and into ui-text.yml data file

Fix path bugs in breadcrumbs

Merge branch 'feature/visual-refresh' into develop

Merge branch 'feature/refactor-includes-layouts' into develop

Merge branch 'feature/improve-demos' into develop

Add breadcrumb navigation include
- Disable by default
- Add schema.org markup
- Add basic styling