[Battery Usage] Make the timestamp slot info text format localizable.

(1) Some languages could localize the hephen to "~" or "to".
(2) Both 12hr format and 24hr format will have spaces around the hyphen.

Bug: 267185303
Bug: 266839251
Bug: 267349989
Bug: 267572852
Bug: 267595534
Test: manual
Change-Id: I62ff37d9ab20292621ee29ee3080cea7f8fd0fdb