Fix breadcrumbs

Looking at the generated breadcrumbs, the newly committed #738174: Integrate og features better introduced a new broken breadcrumb, but there were broken breadcrumbs all around.

- the new OG integration overshadowed our custom breadcrumb, so we need to move that later in the code
- the export breadcrumbs did not include the project or language name/path from the parent level
- the import breadcrumbs were not conforming to others and did not include the explore languages and the language level
- the translation page lacked breacrumbs for the parent level too

This looks to be filling in the missing spots and fixing the broken ones so we have a complete breadcrumb navigation.