Docx reader: fix for Issue #1692 (i18n styles)

This patch builds paragraph styles tree, then checks if paragraph has
style.styleId or style/name.val matching predetermined patterns.
Works with "Heading#" (name.val="heading #") for headings and
"Quote"|"BlockQuote"|"BlockQuotation" (name.val="Quote"|"Block Text")
for block quotes.
Docx reader: add tests for i18n headers.

This tests blockquotes and headers in Russian. Previous tests make sure
that this doesn't produce a regression in en-us Header and Blockquotes.
Docx test: Remove Danish header test.

Redundant, now that we're testing for a more generalized sort of
internationalized blocks.