DefaultNaturalLanguage

is an option for character selections that specifies the language used when checking the spelling of a word in a human natural language selection.

Details

Human natural language selections are those that have LanguageCategory->"NaturalLanguage".
With the default setting DefaultNaturalLanguage->"Language", the language is taken to be the current setting of the Language option.
The language can also be specified explicitly as a string, for example, by setting DefaultNaturalLanguage to "English", "French", or "German".
This option is typically set at the global level, but it can also be set at the level of an individual notebook, cell, or selection.

Examples

A "NaturalLanguage" cell spellchecks in the system's default language:

Wolfram Language code: CellPrint[Cell["zehn Jahre", "Output", ShowAutoSpellCheck -> True, LanguageCategory -> "NaturalLanguage"]]

Overriding the choice of language to use German changes the spelling dictionary used:

Wolfram Language code:

CellPrint[Cell["zehn Jahre", "Output", ShowAutoSpellCheck -> True, LanguageCategory -> "NaturalLanguage", DefaultNaturalLanguage -> "German"]]

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