`node translations_change_keys all` must delete not only the keys, but also the comments

[RomanTsukanov]

Comments like this appear twice if you first delete the keys, then add them again and start auto-translation.

// pehelp.commentAreaRows: "Sets the number of displayed lines in text areas for question comments. In the input takes up more lines, the scroll bar appears." => "يضبط عدد الأسطر المعروضة في مساحات النص لتعليقات الأسئلة. في الإدخال يأخذ المزيد من الأسطر ، يظهر شريط التمرير."