src/LocaleTranslationProvider.php
public function translate(string $key, array $arguments = [])
    {
        if (!isset($this->translations[$key])) {
            return null;
        }

        if (!$this->hasNamedArguments($arguments)) {
            return $this->translateWithoutNamedArguments($key, $arguments);
        }

        return $this->translateWithNamedArguments($key, $arguments);
    }
public function translate(string $key, array $arguments = [])
    {
        if (!isset($this->translations[$key])) {
            return null;
        }

        if (!$this->hasNamedArguments($arguments)) {
            return $this->translateWithoutNamedArguments($key, $arguments);
        }

        return $this->translateWithNamedArguments($key, $arguments);
    }
@param string $key
@param array  $arguments

@return string|null