system/Language/Language.php
public function getLine(string $line, array $args = [])
	{
		// ignore requests with no file specified
		if (! strpos($line, '.'))
		{
			return $line;
		}

		// Parse out the file name and the actual alias.
		// Will load the language file and strings.
		[
			$file,
			$parsedLine,
		] = $this->parseLine($line, $this->locale);

		$output = $this->language[$this->locale][$file][$parsedLine] ?? null;

		if ($output === null && strpos($this->locale, '-'))
		{
			[$locale] = explode('-', $this->locale, 2);

			[
				$file,
				$parsedLine,
			] = $this->parseLine($line, $locale);

			$output = $this->language[$locale][$file][$parsedLine] ?? null;
		}

		// if still not found, try English
		if (empty($output))
		{
			$this->parseLine($line, 'en');
			$output = $this->language['en'][$file][$parsedLine] ?? null;
		}

		$output = $output ?? $line;

		if (! empty($args))
		{
			$output = $this->formatMessage($output, $args);
		}

		return $output;
	}
public function getLine(string $line, array $args = [])
	{
		// ignore requests with no file specified
		if (! strpos($line, '.'))
		{
			return $line;
		}

		// Parse out the file name and the actual alias.
		// Will load the language file and strings.
		[
			$file,
			$parsedLine,
		] = $this->parseLine($line, $this->locale);

		$output = $this->language[$this->locale][$file][$parsedLine] ?? null;

		if ($output === null && strpos($this->locale, '-'))
		{
			[$locale] = explode('-', $this->locale, 2);

			[
				$file,
				$parsedLine,
			] = $this->parseLine($line, $locale);

			$output = $this->language[$locale][$file][$parsedLine] ?? null;
		}

		// if still not found, try English
		if (empty($output))
		{
			$this->parseLine($line, 'en');
			$output = $this->language['en'][$file][$parsedLine] ?? null;
		}

		$output = $output ?? $line;

		if (! empty($args))
		{
			$output = $this->formatMessage($output, $args);
		}

		return $output;
	}
Parses the language string for a file, loads the file, if necessary,
getting the line.

@param string $line Line.
@param array  $args Arguments.

@return string|string[] Returns line.