Django-webpush

- Add i18n Support (89) rcmurphy
- [Fix] duplicate SubscriptionInfo matches (96) Tyilo
- [Fix] Memcached don't accept space in key (102) dadokkio
- **[Upgrade] Django 4-support (105) clearminds privatgt**

- Added the detection of the initial state of subscription (74)
- Fixing various encoding for pypi publishing

- Adding django 3.0 compatibility 76
- Added ability to customize button class 75

- Add Icons and click action to push notification by JLucasRS.