Blank page when language is not en-US or el-GR

Hi,

I installed your plugin then all pages became blank.
I found error log as follows.

PHP Warning:  require(.../wp-content/plugins/github-profile-display/languages/ja/index.php) [<a href='function.require'>function.require</a>]: failed to open stream: No such file or directory in .../wp-content/plugins/github-profile-display/githubwordpress.php on line 15

“wp-content/plugins/github-profile-display/languages” has only two directory “en-US” and “el-GR”, so error is occurred if other language settings.
I hope fixing it.

https://www.ads-software.com/plugins/github-profile-display/