Russian translation complete + no *.mo files in .gitignore

1) About *.mo files in .gitignore, there are more usable to install package without thinking of generating *.mo files by hands.
2) `settings fix` means that blog-specific settings now available to change from global django settings
3) new param `BLOG_POSTS_LIST_TRUNCWORDS_COUNT` is for count of words for standart django-filter `truncatewords_html` in posts_list, where by this time was a full-content of blog post istead of a short version.