ADD tests + translation fixies + bug fixies
1) ADD acceptance tests
1.1) currency
- add currency
- edit currency
- show currency
- list currencies
1.2) present coaches
- add
- remove
- edit
- list
- show
1.3) training realization
- calc payment
- cancel lesson
1.4) variable field categories
- show
- edit
- list
- remove
- create
1.5) user
- change role
2) FIX variable field category permissions
3) FIX foreign key constrain for variable field category
4) FIX variable field public key
5) FIX variable field categories listing view
6) EDIT permissions