Indictate that there's additional characters
Keys with popover are hard to find, indicate these by printing the first character in the upper right corner. Not completely happy yet as the layout looks less balanced then but might still be a start.
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vk-driver: Fix doc string
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osk-widget: Fix docstring
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osk-widget: Add a hint that there's a popover
We display the first symbol in a slightly dimed color:
Edited by Guido Günther