I tried uninstalling and re-installing the openvix-vix-night-hd skin, didn't make any difference.
Next I flashed back to image 5.1.013 (as I didn't find 5.1.014 downloadable) without restoring settings and updated it to 5.1.014, no restoring and not even channel search, just checked that pressing the green button showed the empty timer list and green circle with text "Add".
Then I restored the settings and plugins from the backup that was created when I started flashing, and the green button showed again the timer list without any text for the color buttons, like in the previous picture I posted. BTW, the color buttons are also shown as colored the same way as in the "default" skin, not black-centered circles like they used to be in vix-night-hd. Just like the previous picture I posted.
Changed to vix-day-hd skin which showed the color button text as expected, nothing wrong there.
Deleted and re-installed the vix-night-hd skin, thinking that it may work differently now that my ui was using another skin (unlike previously when I did the uninstall and re-install without changing the skin used), but when I changed back to vix-night-hd, it showed the timer list without the color button texts again.
Oh, and the user interface language is Finnish (suomi), as was asked and guessed in the thread. But changing to English didn't bting the color button texts back again and didn't change the color balls to circles either, so I don't think posting another picture with English as the ui language would enlighten this more.