5428: update trackers count subtitles wording.

Description

• mentioning on the app home page that we are counting detected trackers: the subtitle of "Manage apps' trackers" is x detected trackers, y allowed trackers (replace app by detected)
• on the Manage apps' trackers page, the subtitle for each app is shortened into z/x blocked trackers, w leaks. With z the number of blocked trackers, x the number of detected trackers, w the number of leaks.

Issues

e/backlog#5428 (closed)

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