ADD tests + translation corrections + small fixies
1) ADD tests
1.1) training lessons UCs
- add
- edit
- delete
- show
- list
1.1.1)training lesson realizations UCs
- calc payments
- cancel scheduled lesson
- close scheduled lesson
- create individual scheduled lesson
- excuse
- sign in
- fill attendance
- remove scheduled lesson
- reopen scheduled lesson
1.1.2) attendances UCs
- view training attendance
- view user training attendance
1.2) coach obligations UCs
- add
- delete
- edit
- show
1.3)
2) FIX
2.1) Fix attendance fill step
- crashed if no attendance entries were filled
- made error when something not filled
2.2) Fix training realization sign in
- broken behaviour
3) ADD can_sign_in? for individual training lesson realization
- if something went wrong return customized error message
4) EDIT training lesson realization
- if not signed in  & signed out limits set return from time
5) ADD regular training show my attendance button for training player
6) FIX sign in button show on training lesson realization
7) ADD training lesson diabled fields after scheduled lessons exists
8) EDIT translations