Questions about translations and pluralization

[Константин Комков]

1. If I want use plural for book without numbers what I need to do?

I want to write word - books.

2. If I write

T("You have %s %%{book}", symbols=10)

I get: You have 10 books

If I want to change language, like 

T.force('ru')

I get: 'You have 10 book'. I want to get: 'У меня есть 10 книг'

What I need to write in laguages/ru.py?

3. If I add two words in laguages/ru.py, like:

'add':'добавить',
'word':'слово',

I wrote:

T.force('ru')
T("add word")

I got: 'add word'

If I write:

T("add")+" "+T("word")

I get: 'добавить слово'. Are there way to translate both words in time?

4. If I want to get uppercase letter I tried use something like that:

%%{[<modifier>]<word>[<parameter>]}

but nothing work. How can I get: 'Add' or 'Добавить'?

Thank you!