Use more specific class names: grouped -> btn-grouped

app/assets/stylesheets/generic/buttons.scss

app/views/admin/users/show.html.haml

app/views/profiles/groups/index.html.haml

app/views/projects/branches/_branch.html.haml

app/views/projects/commit/_commit_box.html.haml

app/views/projects/hooks/index.html.haml

app/views/projects/issues/_issue.html.haml

app/views/projects/issues/show.html.haml

app/views/projects/merge_requests/_show.html.haml

app/views/projects/merge_requests/show/_mr_title.html.haml

app/views/projects/milestones/_milestone.html.haml

app/views/projects/milestones/show.html.haml

app/views/projects/notes/_form.html.haml

app/views/projects/team_members/index.html.haml

app/views/projects/walls/show.html.haml

app/views/projects/wikis/_main_links.html.haml

app/views/snippets/current_user_index.html.haml

app/views/snippets/index.html.haml