User curation page improvements

[fbacall]

Summary of changes

• Add a "max age" filter to the user curation page to limit query based on user registration date.
• Apply 1 month max age when visiting from email notification/user menu.
• I18n for user curation page.

Motivation and context

Initial load was very slow on ELIXIR TeSS due to the "with content" check iterating over a large number of users.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

Pull request overview

This PR improves the curator “Users” page performance and usability by introducing a “max age” (registration date) filter, defaulting that filter when navigating from notifications/menus, and moving user-curation UI strings toward I18n.

Changes:

• Add max_age filtering to CuratorController#users and surface it as a new dropdown filter on the curation page.
• Default curation links (user menu + approval emails) to max_age=1.month to reduce slow initial loads.
• Introduce I18n keys for the user curation page and refactor recent activity formatting / curation JS into app/assets/javascripts/curation.js.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/controllers/curator_controller_test.rb	Update assertions for recent activity text formatting.
config/locales/en.yml	Add I18n keys for user curation page UI and activity strings.
app/views/layouts/_user_menu.html.erb	Add default max_age param to “Curate users” link.
app/views/curator/users.html.erb	Add max-age dropdown, apply I18n, refactor page structure, remove inline JS.
app/views/curation_mailer/user_requires_approval.text.erb	Add default max_age param to email deep-link.
app/views/curation_mailer/user_requires_approval.html.erb	Add default max_age param to email deep-link.
app/helpers/curators_helper.rb	Add max-age option helper + I18n-based approval labels.
app/controllers/curator_controller.rb	Implement max_age parsing/filtering for the users query.
app/assets/javascripts/curation.js	Add JS helpers for filter param application and curate-user AJAX.
app/assets/javascripts/application.js	Initialize Curation.init() on Turbolinks load.

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