bulletin: translation fix

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
deposit: fix dynamic field list addition

* Fixes case in `update_element` function when the field index increases.
  (closes #1784) (PR #2372)

Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Konstantinos Kostis <konstantinos.kostis@cern.ch>
Tested-by: Georgios Kokosioulis <giokokos@gmail.com>
previewer: fix base template for bundles support

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
previewer: initial release of ZIP file plugin

* NOTE Add following line to your configuration to enable this plugin
  `CFG_PREVIEW_PREFERENCE = {'.zip': ['zip']}`  (PR #2321)

Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Antonios Manaras <antonios.manaras@cern.ch>