For the translation, if someone could summarize the changes once you decided what should be best and send them, that would be easier.
Never mind, Nicolas! After this discussion I will send you translation to the Transifex.
This thread of forum is more simpler way to talk all Russian people what they think about translation.
About letters in the phone numbers.
No, we have not any letters in phone numbers, only digits.
master_b say that will be more helpful to restrict input fields so that customers could not accidentally input letters in phone numbers.