Change default language to English
One-sentence description
Change default language to English
Why?
Because we have international members now and we shouldn't force them to switch to English.
Current implementation
https://gitlab.science.ru.nl/thalia/concrexit/blob/master/website/thaliawebsite/settings/settings.py#L197 The default language is Dutch, so this means that devices set to a non-Dutch/English language automatically select it as fallback.
Desired implementation
The default language should be English, so this means that devices set to a non-Dutch/English language automatically select it as fallback.
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