ADD repository languages percentage api

app/controllers/concerns/repository/languages_percentagable.rb

@@ -0,0 +1,19 @@
+module Repository::LanguagesPercentagable
+  extend ActiveSupport::Concern
+
+  def languages_precentagable
+    result = Gitea::Repository::Languages::ListService.call(@owner.login,
+      @repository.identifier, current_user&.gitea_token)
+
+    result[:status] === :success ? hash_transform_precentagable(result[:body]) : nil
+  end
+
+  # hash eq:{"JavaScript": 301681522,"Ruby": 1444004,"Roff": 578781}
+  def hash_transform_precentagable(hash)
+    total_byte_size = hash.values.sum
+    hash.transform_values { |v|
+      ActionController::Base.helpers
+        .number_to_percentage((v * 100.0 / total_byte_size), precision: 1)
+    }
+  end
+end