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apply_filters( 'theme_locale', string $locale, string $domain )

Filters a theme’s locale.

$locale: (string) The theme's current locale.
$domain: (string) Text domain. Unique identifier for retrieving translated strings.

Used By	Description
wp-includes/l10n.php: load_theme_textdomain()	Load the theme’s translated strings.

Version	Description
3.0.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/theme_locale