feat(notifications): add translation activity summary notification

[nijel]

This allows users to follow activity without being overwhelmed with all the details.

Fixes #13071

[Copilot]

Pull request overview

This PR introduces a new digest-only email notification that summarizes translation activity over a period (aimed at making notification emails shorter and more actionable), replacing the previous default weekly “new strings” notification for watched projects.

Changes:

• Added TranslationActivitySummaryNotification which builds per-translation counts and deep-links into search queries for the relevant activity.
• Added new mail templates (HTML + subject) for the activity summary digest.
• Updated defaults, docs, and tests to cover the new notification and the default-notification switch.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
weblate/accounts/notifications.py	Adds the new digest-only notification logic and search-link generation.
weblate/templates/mail/translation_activity_summary.html	New digest HTML template rendering per-translation activity counts with links.
weblate/templates/mail/translation_activity_summary_subject.txt	New digest subject template for the activity summary.
weblate/accounts/data.py	Switches the default weekly watched-project digest from NewStringNotificaton to the new summary.
weblate/accounts/tests/test_notifications.py	Adds coverage for digest-only frequency and end-to-end weekly digest rendering/links.
docs/user/profile.rst	Documents the new notification in the Notifications section.
docs/changes.rst	Adds an entry to the changelog for the new notification.

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[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
7609	2	7607	675

View the top 2 failed test(s) by shortest run time

weblate.accounts.tests.test_views.ProfileTest::test_watch

Stack Traces | 0.278s run time

self = <weblate.accounts.tests.test_views.ProfileTest testMethod=test_watch>

    def test_watch(self) -> None:
        self.assertEqual(self.user.profile.watched.count(), 0)
        self.assertEqual(self.user.subscription_set.count(), 10)
    
        # Watch project
        self.client.post(reverse("watch", kwargs={"path": self.project.get_url_path()}))
        self.assertEqual(self.user.profile.watched.count(), 1)
        self.assertEqual(
            self.user.subscription_set.filter(project=self.project).count(), 0
        )
    
        # Mute notifications for component
        self.client.post(reverse("mute", kwargs=self.kw_component))
>       self.assertEqual(
            self.user.subscription_set.filter(component=self.component).count(), 20
        )
E       AssertionError: 21 != 20

.../accounts/tests/test_views.py:985: AssertionError

weblate.accounts.tests.test_views.ProfileTest::test_watch_component

Stack Traces | 0.293s run time

self = <weblate.accounts.tests.test_views.ProfileTest testMethod=test_watch_component>

    def test_watch_component(self) -> None:
        self.assertEqual(self.user.profile.watched.count(), 0)
        self.assertEqual(self.user.subscription_set.count(), 10)
    
        # Watch component
        self.client.post(reverse("watch", kwargs=self.kw_component))
        self.assertEqual(self.user.profile.watched.count(), 1)
        # All project notifications should be muted
>       self.assertEqual(
            self.user.subscription_set.filter(project=self.project).count(), 20
        )
E       AssertionError: 21 != 20

.../accounts/tests/test_views.py:1016: AssertionError

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	9 changed	May 12, 2026, 7:22 PM