[ru] Incorporate changes from bc3f922f25 and b294744d98.

"Add a paragraph to warn on single quotes in Windows system shell."
"Minor updates (Windows & typo)"
[ru] Incorporate two minor fixes from 67bc107ad8 and c8571b3b9b

"Make two timestamps in diff output more distinct."
"git fast-import doesn't need to be run in Git directory."
[ru] Incorporate changes from fbc3502da9

"Update information about git-p4"