Change number_to_human calls to always use 3-digits precision (#16469)

app/helpers/accounts_helper.rb

app/helpers/application_helper.rb

app/views/about/more.html.haml

app/views/about/show.html.haml

app/views/accounts/_header.html.haml

app/views/accounts/show.html.haml

app/views/admin/dashboard/index.html.haml

app/views/admin/follow_recommendations/_account.html.haml

app/views/admin/instances/_instance.html.haml

app/views/admin/tags/_tag.html.haml

app/views/directories/index.html.haml

app/views/relationships/_account.html.haml

app/views/settings/featured_tags/index.html.haml

app/views/statuses/_detailed_status.html.haml