legacy: fix websearch unformatted vars stacktrace

* Changes output generation of `perform_index` to use `.format()`.
  Requesting the admin interface page for WebSearch previously always
  resulted in a stacktrace due to unformatted strings.

Signed-off-by: Dimitrios Semitsoglou-Tsiapos <dsemitso@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
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>
workflows: Holding Pen authorization

* Adds decorators for permission check to Holding Pen blueprints.

* Adds new ACL with basic "viewholdingpen" authorization to access
  the Holding Pen.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
access: Holding Pen role

* Adds Holding Pen role and authorization linked to the
  viewholdingpen action in workflows module.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
access: fix holdingpenusers role definition

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
previewer: fix base template for bundles support

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

* Adds basic access controll check for record only.

* 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>
cloudconnector: fixes in the cloud apps

* User can succesfully connect through his google/dropbox accounts
  and manage his files.

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>
cloudconnector: improvements and fixes

* Several PEP257 and PEP8 fixes

* Delete `factory.py`

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>