Squashed commits:
[c6cbd24] Remove fuzzy translation
[fd0ec11] Add newsletter app
Squashed commits:
[219ef97] Add newsletter from to settings
[00a2804] Add newsletter app
Squashed commits:
[dc13774[ Fix translations
[26f3bea] Prevent mass deletion from admin and fix add form
[2024827] Rename newsletter_optout to receive_newsletter
[baeb801] Squash migrations
[a8b50e7] Tests for email sending
[1d1f0b1] Move object creation and login to setUp
[3d0fda1] Add tests for newsletters that were not sent
[32e4196] Add more and fix tests
[82e5e6f] Thalia headers on the send page
[0d3b9ad] Send newsletter directly to user in BCC instead of using the mailman list
[8855730] Start writing tests
[8007c19] Add check in model for start and end times
[fbcd91c] Add rendering and sending email code
[507e932] Fix PEP styles
[1432cf0] Use main partner from the partners module
[31708d9] Add newsletter images to static
[299a873] Make frontend preview for newsletter
[e01e3d9] Change end date text
[c5661ba] Make newsletters multilingual
[4dc2579] Add help texts to newsletter fields
[337cf5e] Add introduction field to admin form
[262629b] Add introduction textfield to newsletter
[5a46afd] Re-add CASCADE on delete
[3270015] Add newsletter migrations
[bdb5b96] Add admin for newsletter models
[a613072] Finish models
[2e8946f] Add base files