Russian translation updated by Kirill Bezrukov (#15953)

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German translation updated by Daniel Felix (#15955)

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move setting_default_projects_tracker_ids at de.yml to alphabetical order

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Bulgarian translation changed by Ivan Cenov (#15956)

* notice_account_activated
* setting_login_required

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Bulgarian translation updated by Ivan Cenov (#15956)

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Spanish translation updated by Borja Campina (#15959)

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