Indication of a keyboard layout

[Konstantin Rybakov]

I'm submitting a…

[ ] Bug
[X ] Feature Request
[ ] Other (Please describe in detail)

Current Behavior

There is no indication of the current keyboard layout,
so user has to type password times and times until the correct keyboard layout is guessed.

Expected Behavior

There must be visible indication of current keyboard layout on the lock screen, like Keyboard: Ru

Reproduction Instructions

Environment

Output of i3lock --version:

i3lock version: 

[Michael Stapelberg]

This is a duplicate of #287