s/was/were/ for plural subjects

app/controllers/admin/groups_controller.rb

@@ -69,7 +69,7 @@ class Admin::GroupsController < Admin::ApplicationController
 
   def project_teams_update
     @group.add_users_to_project_teams(params[:user_ids], params[:project_access])
-    redirect_to [:admin, @group], notice: 'Users was successfully added.'
+    redirect_to [:admin, @group], notice: 'Users were successfully added.'
   end
 
   def destroy

app/controllers/admin/teams/members_controller.rb

@@ -11,7 +11,7 @@ class Admin::Teams::MembersController < Admin::Teams::ApplicationController
       user_team.add_members(user_ids, access, is_admin)
     end
 
-    redirect_to admin_team_path(user_team), notice: 'Members was successfully added into Team of users.'
+    redirect_to admin_team_path(user_team), notice: 'Members were successfully added into Team of users.'
   end
 
   def edit

app/controllers/groups_controller.rb

@@ -73,7 +73,7 @@ class GroupsController < ApplicationController
 
   def team_members
     @group.add_users_to_project_teams(params[:user_ids], params[:project_access])
-    redirect_to people_group_path(@group), notice: 'Users was successfully added.'
+    redirect_to people_group_path(@group), notice: 'Users were successfully added.'
   end
 
   def edit

app/controllers/teams/members_controller.rb

@@ -18,7 +18,7 @@ class Teams::MembersController < Teams::ApplicationController
       user_team.add_members(user_ids, access, is_admin)
     end
 
-    redirect_to team_members_path(user_team), notice: 'Members was successfully added into Team of users.'
+    redirect_to team_members_path(user_team), notice: 'Members were successfully added into Team of users.'
   end
 
   def edit