github: HTML DOI embed code fix

* Fixes unclosed tag in embeddable HTML code for the DOI badge.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
base: format element translation fix

* Fixes typo  in variable name introduced in b60fe4c.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
base: missing link tag fix

* Fixes issue with link tags to record files not being present
  on records page.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
tests: hidden tags test case

* Adds test case to ensure hidden tags are not present in export formats.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
Merge branch 'master' of git://github.com/lnielsen-cern/zenodo into next-assets