translation fix
[TASK] Created new controller for login / registration
[TASK] Created Template for login
removed debug
Merge branch 'obi12341/master'
[TASK] Created Login & Register Template
[TASK] fixed register formular
[TASK] Created Model User
[TASK] Created UserRepository
[TASK] User Model
[TASK] registration functions
[TASK] firstname and lastname does not get lost if username exists
[TASK] redirection if user is/is not logged in
[TASK] added expiration and callable without functionality
[TASK] Added expiration date and callable functionality
[TASK] Delete Note after expiration date
[TASK] Maximum callable functionality
[TASK] logout functionality
[TASK] Append logout button to navbar
[TASK] Models expanded

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