TeamStore migration part 2 (#15396)

* Migration completed

* Fix tests

* Reduce to one line

* Fix: change to plain error

* Fix imports

* Trigger CI

* Fix i18

* Fix merge with master

* Trigger CI

app/syncables_test.go

@@ -137,7 +137,7 @@ func TestCreateDefaultMemberships(t *testing.T) {
 
 	// Scientist should not be in team or channel
 	_, err = th.App.GetTeamMember(nerdsTeam.Id, scientist1.Id)
-	if err.Id != "store.sql_team.get_member.missing.app_error" {
+	if err.Id != "app.team.get_member.missing.app_error" {
 		t.Errorf("wrong error: %s", err.Id)
 	}