European Cyrillic Extended installs the Russian locale together with a shared
Cyrillic external font pack so interface labels and Russian content can render
without inflating the firmware image. It also registers a Russian Cyrillic
keyboard layout backed by the firmware's direct keyboard-layout runtime.

The locale remains in review status until native-language review is complete.
The keyboard layout is a direct virtual-keyboard layout; it does not provide
candidate conversion or physical keyboard remapping.

Credits: Russian translations were contributed by polarikus, based on the
polarikus/trail-mate Russian localization PR.
