Anton Stepanov contributed a Russian translation of the ftputil documentation, as of ftputil 2.0.3. Surely, it should be added to the ftputil wiki as RussianDocumentation?, possibly to the release tarball as well. (The English and Russian translation should be handled the same: either both in the tarball or both not.) In any case, we have to be careful that the original documentation charset is compatible with the rendering in the wiki and (if applicable) an HTML file in the distribution.
I finally found out that the encoding of the original reStructuredText file was Windows-CP1251 and managed to convert it with GNU recode to UTF-8. This I put into the wiki, using the rst wiki processor (see WikiProcessors).
ftputil_ru_utf8.txt is now included in the repository (commit 444), so I mark this bug fixed.