Refactored documents app

Ghost Userrequested to merge
refactor-documents into master

/label technical change

Closes #268 (closed), #519 (closed)

Short description

Refactored the documents app. I added a base Document model, with AnnualDocument, AssociationDocument, MiscellaneousDocument and Minutes as subclasses. This removes a lot of duplication, e.g. there now is only one function for downloading a document. This also makes it possible to link events and documents in the future, or to do other cool stuff. I also made everything bilingual.

Edited by Ghost User

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