Permanently remove the rest of the keyboard layout

Originally created by @getsby on #11048 (Redmine)

Hello. I use Tails with only Russian and English keyboard layout.

If I switch the layout I get the Chinese, Vietnamese, and others are not necessary to me. Please give the opportunity to permanently remove unwanted layout.

In previous versions of Tails at the entrance when choosing Russians remained only Russian and English layout, it was very convenient. Thank you.

Related issues

Related to #10913 (closed)
Related to #8294
Related to #5464 (closed)

Edited May 15, 2020 by Ghost User

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