czech.c: Fix overlapping text use correct declension

[gryffus]

• Shorten hotkeys configuration button translation to fit on the button
• Remove duplicate "Julius" mentions in game config menus

Fixes this:

This time in 1 clean commit.

[gryffus]

I added back the Julius mention to configuration settings menu as discussed @bvschaik

Should be ready to merge.

[bvschaik]

Thanks!