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Acronyms only work with one capital letter followed by some capital letters or numbers. By letter, we mean A to Z... So Blah(de fi ni tion) will produce Blah(de fi ni tion).

In your example, are "Россия" all capital letters in russian alphabet ?

Yes, for example:

en: RUSSIA
ru: РОССИЯ(Страна)

Hello. This is my version of solving problem.

1. Add trigger to wiki_pages table:

-- Trigger: alex_wiki_pages_tolower on wiki_pages

-- DROP TRIGGER alex_wiki_pages_tolower ON wiki_pages;

CREATE TRIGGER alex_wiki_pages_tolower
  AFTER INSERT OR UPDATE
  ON wiki_pages
  FOR EACH ROW
  EXECUTE PROCEDURE alex_wiki_pages_tolower();

2.add trigger function to redmine postgresql database:

-- Function: alex_wiki_pages_tolower()

-- DROP FUNCTION alex_wiki_pages_tolower();

CREATE OR REPLACE FUNCTION alex_wiki_pages_tolower()
  RETURNS trigger AS
$BODY$
BEGIN
NEW.title=lower(NEW.title);
return NEW;
END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION alex_wiki_pages_tolower() OWNER TO postgres;

So new pages will created in small leters, even if you taped in capital letters.