Czech
The Czech language is available for pdftex, xetex, and luatex. To write a
document in this language just write in the preamble:
\usepackage[czech, shorthands="]{babel}
In pdftex you also need:
\usepackage[T1]{fontenc}
The current version was prepared by Petr Tesařík, and great care has been taken to ensure backward compatibility with CSLaTeX.
Troubleshooting
This style makes by default the hyphen active to allow repeating it at
the beginning at the line. This is strongly discouraged, because it can
break labels, negative numbers, and other elements; this explains
the option shorthands=" above (which means ‘activate only the "
shorthand’).
If you are using pdftex or xetex and need this feature, just omit
this setting. With luatex there is a better option: add the following
after loading Babel:
\babelprovide[transforms = hyphen.repeat]{czech}
Line breaking
Only luatex. The transform oneletter.nobreak converts a space after
a non-syllabic preposition or conjunction into a non-breaking space.