src/Translatable.php
public function shouldFallback($locale = null)
    {
        if (!$this->getWithFallback() || !$this->getFallbackLocale()) {
            return false;
        }

        $locale = $locale ?: $this->getLocale();

        return $locale != $this->getFallbackLocale();
    }
public function shouldFallback($locale = null)
    {
        if (!$this->getWithFallback() || !$this->getFallbackLocale()) {
            return false;
        }

        $locale = $locale ?: $this->getLocale();

        return $locale != $this->getFallbackLocale();
    }
Should fallback to a primary translation.

@param string|null $locale
@return bool