WIP: Release/1.3

🔖 Thalia Website v1.3.0

Errors resolved

• Fix context of "order" translation, making it 'bestellen' i.p.v. 'volgorde' (!291 (merged))
• Fix ordering of numeric data in pizza frontend, sorting now makes sense (!287 (merged))
• Fix some style issues (!274 (merged))
• Fix "view on site" for vacancies backend (!293 (merged))
• Improve exam and summary upload form (!294 (merged))

New functionality

• Translate Thalia Logo Images (!300 (merged))
• Make sure members cannot cancel or change pizza order when not allowed (!295 (merged))
• Add message to the end of the newsletter regarding language change (!299 (merged))
• 🚚 Add possibility to change order of newsletter items (!298 (merged))

Technical changes

• Refactor parts of CSS (!274 (merged))
• Wiki API unit tested (!286 (merged))
• Remove all old migration scripts, for migrating from old site to new (!296 (merged))