Fix fatal in topic history.

I7f30d8a05e2861ee3a11d2359547d3142e0892c1 will already fix this, too (differently)

Bug: 65051
Change-Id: I362ab38dd79658ee98b3db8f9bf6ee52508fa634
Fix coding conventions violations

Change-Id: I6ec0849b4196899c1f74b67173b17b4e2c58cba6
Localisation updates from https://translatewiki.net.

Change-Id: I92041b8380b0e7186df0e600e7371aef7433a3b2
Merge "Fix coding conventions violations"
Flow test cases should all be @group Flow

Change-Id: I3bdba319fc4f71eaff110595251a5c06af4e885c
Merge "Fix fatal in topic history."
Cleanup unused use statements

Change-Id: If34b44bb787f68f54e1090b952cc39a58eb0066e
Localisation updates from https://translatewiki.net.

Change-Id: Ic4470f976a6e3784d3bf6d73aae1827d3ad45fac
Merge remote-tracking branch 'gerrit/master' into HEAD

Change-Id: Ib07a68e68a0c5c16fa1bb43bbfcdc956a7a46e4a
Merge "Merge remote-tracking branch 'gerrit/master' into HEAD" into frontend-rewrite