Some minor tweaks in views (see #343)

- Add sample links to main page
- Link to hbz lobid-organisation page from footer
- Link to hbz LOD product page from about page
- Remove copyright notice from footer
- Consistently use `<h2>` for headers
- Remove the 'X Documents' text if there is only one result
- Use the lowercased index name as the result page title
Link to english hbz LOD product page from lobid about page (#343)
Highlight active navigation bar element (see #343, #347)
Remove link from `navbar-brand` element (see #343)
Merge pull request #344 from fsteeg/issue-343-views

Some minor tweaks in views