Language map does not close internal 'en_us.json' file after reading

The LanguageMap constructor never closes the InputStream used to read the builtin en_us.json translation file, created here:

InputStream inputstream = LanguageMap.class.getResourceAsStream("/assets/minecraft/lang/en_us.json");

The stream should be closed after use, probably in a similar fashion to how the version.json file is handled.