locale.yml

---
- name: install locale packages
  apt:
    force_apt_get: true
    install_recommends: false
    name: "{{ locale_packages }}"
  register: apt_status
  retries: 60
  until: apt_status is success or ('Failed to lock apt for exclusive operation' not in apt_status.msg and '/var/lib/dpkg/lock' not in apt_status.msg)

- name: generate locale
  when: init_locale != 'C.UTF-8'
  locale_gen:
    name: "{{ init_locale }}"

- name: set locale
  notify: update locale
  copy:
    dest: /etc/default/locale
    content: |
      LANG={{ init_locale }}
      LANGUAGE={{ init_locale }}
      LC_ALL={{ init_locale }}

- name: set locale.gen
  notify: update locale
  lineinfile:
    path: /etc/locale.gen
    regexp: '^(?:# )?({{ init_locale }}.*)$'
    backrefs: true
    line: '\1'

- name: set timezone
  notify: restart cron
  timezone:
    name: "{{ init_timezone }}"

...