TokenStore migration to return plain errors (#14875)

* TokenStore migration to return plain errors

* Fix translations

* Fix: returned error is ignored and http.StatusBadRequest is always returned

* Fix

* Fix translations

* Suggestions

* Changed from BadRequest to NotFound

* Setting the correct http status

* Changed test to expect 404 status

* Fix error

api4/team_test.go

@@ -1826,8 +1826,8 @@ func TestAddTeamMember(t *testing.T) {
 
 	require.Equal(t, tm.TeamId, team.Id, "team ids should have matched")
 
-	_, err = th.App.Srv().Store.Token().GetByToken(token.Token)
-	require.NotNil(t, err, "The token must be deleted after be used")
+	_, nErr := th.App.Srv().Store.Token().GetByToken(token.Token)
+	require.NotNil(t, nErr, "The token must be deleted after be used")
 
 	tm, resp = Client.AddTeamMemberFromInvite("junk", "")
 	CheckBadRequestStatus(t, resp)