as I mention in the title, I want to achieve situation like this...

instead of numbers it should say "-- (sehr schlecht), -(schlecht), 0 (ok), + (gut), ++ (sehr gut)

There are too many examples where we can change numbers, but what's about text. 

Instead of numbers I need to display text. When open the page, default value will be for example "Ok" value, when you click on " + " , text in input field should be changed to gut, another click on " + " , input should be changed to "sehr gut" . The same situation for " - "

Any suggestions ? Thanks is advance