design: implement tooltips and refine delete dialog UI #2035

Job	Run time
Build (Unit-tests & Android-Lint)	3h 36m 20s
Android UI-tests on emulator (31, default)	17m 4s
Android UI-tests on emulator (27, default)	14m 3s
Android UI-tests on emulator (23, default)	14m 56s
Android UI-tests on emulator (29, default)	14m 38s
Android UI-tests on emulator (25, default)	14m 0s
Android UI-tests on emulator (35, default)	21m 5s
Android UI-tests on emulator (34, default)	18m 18s
Android UI-tests on emulator (24, default)	12m 21s
Android UI-tests on emulator (26, default)	14m 41s
Android UI-tests on emulator (30, default)	18m 13s
Android UI-tests on emulator (28, default)	6h 5m 0s
Android UI-tests on emulator (32, default)	17m 54s
Android UI-tests on emulator (33, default)	14m 35s
Android UI-tests on emulator (36, default)	16m 37s
	13h 9m 45s

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