I18n.java

public static ArrayList<String> getAvailableLanguages() {
		ArrayList<String> list = new ArrayList<String>();
		File dir;
		try {
			dir = new File(Paths.get(I18n.class.getProtectionDomain().getCodeSource().getLocation().toURI()).resolve("lang").toString());
			try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir.toPath(), "*.json")) {
				for (Path file : stream) {
					String fileName = file.getFileName().toString().substring(0, file.getFileName().toString().length() - 5);
					list.add(fileName);
					try (InputStream inputStream = Files.newInputStream(new File(Paths.get(I18n.class.getProtectionDomain().getCodeSource().getLocation().toURI()).resolve("lang/" + file.getFileName()).toString()).toPath())) {
						try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
							Map<?, ?> map = GSON.fromJson(reader, Map.class);
							languageNames.put(fileName, map.get("language").toString());
						}
					}
				}
			}
		} catch (IOException | URISyntaxException e) {
			e.printStackTrace();
		}
		return list;
	}