Right chosen letters are not highlighted in green

[ChristineOmeltschenko]

Right chosen letters are not highlighted in green for all letters in exercise "markieren sie alle (A/...)".

It should be clearly visible, that the participant's choice of letter was right by being highlighted in green colour.

Please make the right chosen letter more visible by being highlighted in green colour for all letters in exercise "markieren sie alle(A/.../Z)

[inyono]

To approach this:

• The relevant component is https://github.com/serlo-org/serlo-abc/blob/development/src/components/exercises/find-letter.component.js
• The current logic for handling highlighting is defined here: https://github.com/serlo-org/serlo-abc/blob/development/src/components/exercises/find-letter.component.js#L66
• if the passed feedback isn't correct, you can change the exercise logic in https://github.com/serlo-org/serlo-abc/blob/development/packages/entities/exercises/find-letter.exercise.ts