Locales don't get built when using 'git' in GemFile

[ghanavat]

Hi,
I have been using this plugin for a few weeks. The current public gem version 0.5.1 does not work, I cannot get it to build. Realised that the current master branch does not match with the release 0.5.1. So, I manually copied the files in the lib on my local copy of the installed gem of jekyll-local to see how it reacts. And everything works smoothly. Now, time to push it to production, and realised GitHub Pages doesn't like this plugin. :(

So I considered using the master branch in my GemFile:
gem "jekyll-locale", git: "https://github.com/ashmaroli/jekyll-locale.git", branch: "master"

But, when I build my jekyll site using bundle exec jekyll build, the locales are not getting built as I cannot see the folders for them in the _site anymore.

Please can someone help.
Thanks.

Update:
the gem does not appear in the gem list: gem list git. This is I believe the problem.