Training Module: add examples

[SigritSiht]

AS an Administrative User I WANT TO upload example sentences from file SO THAT I don't have to add exisitng examples one by one

AC:

• [ ] upload file option created
• [ ] file is read
• [ ] content of file is printed out on screen as entered examples (just like when user would have added them one by one)
• [ ] examples can be edited

[SigritSiht]

https://github.com/buerokratt/Training-Module/issues/25