Implement Title Screen

🚀 Feature Proposal

As a user, I want to have the possibility to change my title from a list of unlocked titles.

Motivation

Titles are one key faeture of Akamu's gamification concept.

Technical Details

When clicking on a title it shall be changed. The user gets information on whether this action was successful or not. After clicking the avatar the user gets redirected to the main settings screen.

Example

The user "Otto123" clicks on the recently unlocked title "MathHero". He/She then sees a snackbar which indicates whether the action was successful or not.