[chore] Extract Cyrillic/Russian keyboard (#5610)

Follow-up to #5583.

* Add separate Cyrillic/Russian keyboard

* And remove that from English

* Update French keyboard (is easy)

* Remove yahzhert, that was just a double of QWERTY

* Update Spanish keyboard

* Reduce Japanese to 4 layers and add globe

* Reduce Korean to 4 layers

* Reduce Greek to 8 layers

frontend/ui/widget/virtualkeyboard.lua

@@ -657,6 +657,7 @@ local VirtualKeyboard = FocusManager:new{
         ja = "ja_keyboard",
         pt_BR = "pt_keyboard",
         ko_KR = "ko_KR_keyboard",
+        ru = "ru_keyboard",
     },
 }