load_muplugin_textdomain( string $domain, string $mu_plugin_rel_path = '' )

Load the translated strings for a plugin residing in the mu-plugins directory.

Parameters

$domain

(string) (Required) Text domain. Unique identifier for retrieving translated strings.

$mu_plugin_rel_path

(string) (Optional) Relative to WPMU_PLUGIN_DIR directory in which the .mo file resides.

Default value: ''

Return

(bool) True when textdomain is successfully loaded, false otherwise.

Source

File: wp-includes/l10n.php 

function load_muplugin_textdomain( $domain, $mu_plugin_rel_path = '' ) {
	/** This filter is documented in wp-includes/l10n.php */
	$locale = apply_filters( 'plugin_locale', is_admin() ? get_user_locale() : get_locale(), $domain );

	$mofile = $domain . '-' . $locale . '.mo';

	// Try to load from the languages directory first.
	if ( load_textdomain( $domain, WP_LANG_DIR . '/plugins/' . $mofile ) ) {
		return true;
	}

	$path = WPMU_PLUGIN_DIR . '/' . ltrim( $mu_plugin_rel_path, '/' );

	return load_textdomain( $domain, $path . '/' . $mofile );
}

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Related

Uses

Uses
Uses Description
wp-includes/l10n.php: load_textdomain()

Load a .mo file into the text domain $domain.
wp-includes/l10n.php: plugin_locale

Filters a plugin’s locale.
wp-includes/l10n.php: get_user_locale()

Retrieves the locale of a user.
wp-includes/l10n.php: get_locale()

Retrieves the current locale.
wp-includes/plugin.php: apply_filters()

Call the functions added to a filter hook.
wp-includes/load.php: is_admin()

Whether the current request is for an administrative interface page.
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Changelog

Changelog
Version Description
WP-4.6.0 The function now tries to load the .mo file from the languages directory first.
WP-3.0.0 Introduced.