remove unused gem

Gemfile

@@ -29,7 +29,6 @@ gem 'jbuilder'
 gem 'jquery-rails'
 gem 'kamifusen'#, path: '../kamifusen'
 gem 'kaminari'
-gem 'language_select', '~> 0.0.2'
 gem 'mini_magick'
 gem 'octokit'
 gem 'pg', '~> 1.1'

Gemfile.lock

@@ -261,7 +261,6 @@ GEM
       activerecord
       kaminari-core (= 1.2.2)
     kaminari-core (1.2.2)
-    language_select (0.0.2)
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -481,7 +480,6 @@ DEPENDENCIES
   jquery-rails
   kamifusen
   kaminari
-  language_select (~> 0.0.2)
   listen (~> 3.3)
   mini_magick
   octokit