Add czech oled localization

[kyberpunk]

Hi, I would like to add support for Czech and Slovak specific characters on displays. It covers special characters with diacritic which are not shown in default localization (like ěščřžáéíóúů ...). There are hundreds of meshers in these countries, so I believe it will make them happy. It happens to me very often that I cannot properly read messages from the others on the display.

Wish you nice holidays and Happy New Year!

[CLAassistant]

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