v0.2.0 - rename set_locale to locale_config, add test_connection.yml playbook and update READMEs

roles/locale_config/README.md

@@ -0,0 +1,9 @@
+# dede.common.locale_config
+
+this role will ensure the system locale and language settings  
+you can modify `system_locale` and `system_language` if you want to deviate from the default, which is:
+
+```yaml
+locale_config_locale: 'de_DE.UTF-8'
+locale_config_language: 'en_US.UTF-8'
+```