Add localisation to mail templates

This task depends on YC-416 (do not start this before completion).

We will need to modify existing mail templates to support all languages we support on storefront.

In order to do this we need to create localised templates. E.g. for adm-order-canceled.html there should be adm-order-canceled_en.html, adm-order-canceled_ru.html and adm-order-canceled_uk.html. This has to happen for all templates (i.e. *.txt, *.html and *.properties)

Regarding resources we need to create separate directories and place language specific resources with same names into them.
E.g. for adm-order-canceled/resources/mail-head.jpeg there needs to be adm-order-canceled/resources_en/mail-head.jpeg, adm-order-canceled/resources_ru/mail-head.jpeg and adm-order-canceled/resources_uk/mail-head.jpeg