Help with error during msgfmt checking po file

[Dmitry Pavlov]

Hello,

could you help me please to find out, what is wrong with the following line
in ru.po:

#. src/report/business-reports/taxinvoice.scm
#: ../intl-scm/guile-strings.c:1772
#, c-format
msgid ""
"Width of the logo in CSS format, e.g. 10% or 32px. Leave blank to display "
"the logo at its natural width. The height of the logo will be scaled "
"accordingly."
msgstr ""
"Ширина логотипа в формате CSS (т.е. 10% или 32px). Пустое поле означает, что "
"логотип будет отображаться в исходном размере. Высота логотипа "
"масштабируется соответствующим образом."

when checking file with msgfmt as described on wiki

msgfmt -c --statistics ru.po

I got an error that msgstr is not valid, but build is passed, no errors.

According to comment string it's marked as c format string and may be
msgfmt does not like a % that is alone, not like %s etc., but for de.po
it's ok, no errors.
-- 
С уважением,
Дмитрий Павлов