Resolve "Fix names of categories of pushnotifications"

Luko van der Maas
2018-08-28T16:11:06+02:00

/label ~bug

Closes #663

#### Previous behaviour
Steps to reproduce:

1. View names of categories of push notifications
2. They are all lowercase

#### New behaviour
Steps to validate that it works:

1. View names of categories of push notifications
2. They are all title case