Fix some vaild lang_result that get incorrectly fallbacked

[libenc]

Fix #41

[opsdisk]

Good point about the breaking changes @libenc. The source of truth is the case-sensitive languages in the result_languages.txt file (which is from Google (#41 (comment)) . I like your original code in the PR to make the lang_result match what is exactly in result_languages.txt file.

I played around with just lowercasing everything, but when using the Chrome browser, Google only respected the lang_result when the case was exactly correct ("lang_zh-CN" worked and "lang_zh-cn" didn't).

Bump the version to "1.10.0" and then I'll update the README with your contribution.

[opsdisk]

Thank you @libenc! I also added you to the contributors section of the README.