Mark most debug strings as not translatable.

Move inspector activity strings to a separate file.
Improve description of some debug section strings.

Bug: 63972463
Bug: 64150021
Bug: 64148883
Bug: 64149154
Bug: 64148583
Bug: 64148543
Bug: 64148848
Test: None
Change-Id: I595bbe1ab240a4dfd1a74f5a7858cca85b7eb61d