Split keyboard variant
_Originally created by @alant on [#10817 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/10817)_ The list of different keyboard layouts is very long. This was sometimes quite long. Splitting the selection in two steps: first language, then the variant (optional) might help. That’s a bonus as the auto-selection should already provide something good and that was not preventing people from doing their job. ### Attachments * [Greeter.Language.&.Region.png](https://redmine.tails.boum.org/code/attachments/download/1132/Greeter.Language.&.Region.png) Parent Task: tails/tails#12069
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