Hi Klemen,
When viewing a ticket, it shows the status as, "Customer didn't read this reply yet." It would be grammatically better to say, "Customer hasn't read this reply yet."
"Didn't" is past tense, which doesn't agree with "yet."
"Hasn't" is present tense and includes the potential that the person will, at time some, do the action.
"He didn't do it." (the action is complete)
"He hasn't done it." (the action is, possibly, not complete)
I know the language file can be edited, but I thought it would be good to update the message in the master code

Thank you