- Externalize strings in controllers
- Update PO file

Signed-off-by: Rémy Coutable <remy@rymai.me>

Enables frozen string for the following:

* app/controllers/*.rb
* app/controllers/admin/**/*.rb
* app/controllers/boards/**/*.rb
* app/controllers/ci/**/*.rb
* app/controllers/concerns/**/*.rb

Partially addresses #47424.

This whitelists all existing offenses for the various CodeReuse cops, of
which most are triggered by the CodeReuse/ActiveRecord cop.

Users were unable to change their password through the "Reset password"
link that was sent to their email if they were logged in. This is due to
a default controller filter from Devise that requires the user to not be
logged in in order to use this link.

When sign-in is disabled:
 - skip password expiration checks
 - prevent password reset requests
 - don’t show Password tab in User Settings
 - don’t allow login with username/password for Git over HTTP requests
 - render 404 on requests to Profiles::PasswordsController

Closes #1980

Skipped CI because it has already passed. Had to rebase due to CHANGELOG.

Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2611

Don't display the password editing form if the user's token is expired;
redirect to the form that allows users to request a new password reset
token.