Ch. 9 of Writer Guide has this text: > Selecting a language for a paragraph style > The language selected for a document (on Tools > Options > Language Settings > > Languages) determines the dictionary used for spelling, thesaurus, hyphenation, the decimal > and thousands delimiter used, and the default currency format. You can only use a language > whose dictionary is installed. The "You can only use a language whose dictionary is installed" is wrong. Any language may be used here, not only which has an installed dictionary.
Corrected in file for LO Writer Guide 24.8.