Added upport for Yandex.Dictionaries service.

Moved common code between Yandex.Translate and Yandex.Dictionaries into
a separate parent class YandexTranslationService.

Closes #12 - Yandex.Dictionaries.
Hide translation field when service supports only dictionary.
Added support for translating TAOT.

Closes #11 - Localization.
Added Ukrainian translation.
Added Russian translation.
A small update to .gitignore.