Remove 2nd 'members' entry in the menu

There were 2. There should be 1.

See merge request !75

Make events multilingual and translate app strings



See merge request !71

Override all registration templates



See merge request !70

Fix style issue on member pages and change ex-members filter

Closes #32

See merge request !72

New migration for events model, added a deadline for cancelling your registration.

Also fixed a small typo in events model.

See merge request !69

Style changes part 1

The login page has been styled. And the buttons in the top-right corner are better than ever before. And closes #72.

Soon in a pull request near you: styled password reset pages and more!

See merge request !68

Change board/committee pages

Closes #69 

- Remove JavaScript usage for the board pages and use indexed urls
- Rename the urls of the committee pages
- Add the board url to the menu
- Replace default committtee placeholder image
- Preserve the i18n fields from a base class in the translations util
- Fix adding a CommitteeMembership for a board (they were not shown in the list due to the manager being overridden)
- Fix problems when adding/updating a CommitteeMembership of a user that is marked as chair.
- Translatable committee names
- Translatable roles in committeememberships

See merge request !65

- Use fields instead of fieldset in admin
- Preserve i18n fields from base in ModelTranslateMeta
- Re-enable usage of name for boards

Add docker image

Add a docker image.

Zie dit: @lrijneveld, @gmulder

See merge request !67

Add two age filters in the members admin page

Closes #70

See merge request !66

Change committees to activemembers



See merge request !63

- Update the value of _was_chair in `save`, since `__init__` is not called when you do not get a fresh object from the db.