When in the window for configuring KMail Receive Accounts and one has a POP3 account, this account is selected. The text to the right of the green button is showing a lokalized message; no activity is shown. Then the Restart button is applied, below the Remove button and the separator line. Now the text to the right of the green button is showing the text Ready, which should be lokalized to "Gereed" in the Dutch language. All messages in kdepim are lokalized for the Dutch language. After clicking on "Check for new messsages" and holding down to be able to activate checking of only that POP account, going to the configuration dialog again, this dialog shows the message "Gereed", as it should. Selecting that POP account again and applying Restart, the message is again Ready.
For me it's ok. Reopen it if not the case and past a screenshot. Regards