Eugen Rochko 555c4e11ba
Add validations to admin settings (#10348)
* Add validations to admin settings

- Validate correct HTML markup
- Validate presence of contact username & e-mail
- Validate that all usernames are valid
- Validate that enums have expected values

* Fix code style issue

* Fix tests
2019-03-23 14:07:04 +01:00
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