update Russian proofreading rules

Change-Id: Iedc3af5671241a6e9202916c0a813f0f91303e8f
Lightproof: restore paragraph based proofreading

Instead of the sentences suggested by the incomplete sentence
boundary detection of LibreOffice (enabled in version 4), Lightproof
works on full paragraph text again, allowing more precise analysis of
the text.

See http://nabble.documentfoundation.org/Grammar-checker-Undocumented-change-in-the-API-for-LO-4-td4030639.html

Change-Id: Ifc967e5b3f27da5b0edeebdb73b8f0b97c938280