src/Metabox/Metabox.php
public function addTranslation(string $key, string $translation): MetaboxInterface
    {
        $this->l10n[$key] = $translation;

        return $this;
    }
public function addTranslation(string $key, string $translation): MetaboxInterface
    {
        $this->l10n[$key] = $translation;

        return $this;
    }
public function addTranslation ( string $ key , string $ translation ) : MetaboxInterface { $ this -> l10n [ $ key ] = $ translation ; return $ this ; }
Add metabox translation.

@param string $key
@param string $translation

@return MetaboxInterface
Add metabox translation .