Hello Sergey,
you can modify the text of the field of Guestbook in the language properties (step 1, click on the propeties, for example the "internet Site" is blog_website field), but the check of the field is not possible change. For example in the email field is needed insert the email.

hope this help.

I need to change field blog_name "Наименование" to "Имя" (russian I mean):
blog_website "Веб-сайт" to "Тема отзыва"
blog_message "Сообщение" to "Отзыв"
blog_comment "комментарий" to "отзыв"
blog_comments "комментарий" to "отзывы"
blog_no_comment "Коммментариев нет" to "Отзывов нет"

I understand the field e-mail must be ***@***.**
But I want to change only text fields.

I change this fields and see good result in preview in program but when transfer it to hosting I see nothing change.
If you can't translate why try to do it? Or give us chance to change it.

don't work, sir. see attached file- it's preview in websitex5 and watch the same in internet http://весна43.рф/page-7.php

Excuse names of fields have changed, all has turned out... There was a problem with a site name on cyrillic