Redmine

hi, everyone

Recently, I tried to install the new version 4.0 and added some supported plugins,
unfortunately,i found these plugins could not display the default language.

Is the problem with redmine? or the plugin?
How do I adapt the language?

Details are as follows:

 Environment:
  Redmine version                4.0.4.stable
  Ruby version                   2.3.8-p459 (2018-10-18) [x86_64-linux]
  Rails version                  5.2.3
  Environment                    production
  Database adapter               Mysql2
  Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
  Mailer delivery                smtp
SCM:
  Subversion                     1.7.14
  Git                            1.8.3.1
  Filesystem                     
Redmine plugins:
  additionals                    2.0.20
  computed_custom_field          1.0.7
  projects_tree_view             0.0.9
  redmine_checklists             3.1.16
  redmine_contacts               4.2.5
  redmine_favorite_projects      2.1.0
  redmine_issue_badge            0.1.0
  redmine_issue_dynamic_edit     0.6.7
  redmine_lightbox2              0.5.0
  redmine_percent_done           1.1.0