Make event-dependent information configurable

[florianschmidt1994]

Currently there are a couple of places such as

• https://github.com/BreakOutEvent/breakout-frontend/blob/develop/src/common/resources/translations/translations.de.js
• https://github.com/BreakOutEvent/breakout-frontend/blob/develop/src/common/resources/translations/translations.en.js
• https://github.com/BreakOutEvent/breakout-frontend/blob/develop/src/server/views/static/content/newsletter.handlebars

• breakout-frontend/src/client/react/Components/Participate/Participation.jsx

  Line 77 in a62c810

  tshirtSizes: ['S', 'M', 'L', 'XL']

any many more (search for OneDollarGlasses, 2018, IBAN, ...) that have information which is dependent on the current event. This information needs to be configurable easily so that no big code changes are necessary before starting a new BreakOut in the next season