Add hide activity option (#11353)

* Add hide activity option

This closes https://github.com/go-gitea/gitea/issues/7927

* Adjust for linter

* Adjust for linter

* Add tests

* Remove info that admins can view the activity

* Adjust new tests for linter

* Rename v139.go to v140.go

* Rename v140.go to v141.go

* properly indent

* gofmt

Co-authored-by: Jonas Lochmann <git@inkompetenz.org>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

options/locale/locale_en-US.ini

@@ -392,6 +392,7 @@ follow = Follow
 unfollow = Unfollow
 heatmap.loading = Loading Heatmap…
 user_bio = Biography
+disabled_public_activity = This user has disabled the public visibility of the activity.
 
 form.name_reserved = The username '%s' is reserved.
 form.name_pattern_not_allowed = The pattern '%s' is not allowed in a username.
@@ -430,6 +431,9 @@ continue = Continue
 cancel = Cancel
 language = Language
 ui = Theme
+privacy = Privacy
+keep_activity_private = Hide the activity from the profile page
+keep_activity_private_popup = Makes the activity visible only for you and the admins
 
 lookup_avatar_by_mail = Look Up Avatar by Email Address
 federated_avatar_lookup = Federated Avatar Lookup