Migrate Update method from ChannelStore to return idiomatic plain error (#14687)

* Partial advances

* Update migrated

* Fix imports

* Suggestions

* Suggestions

* Updating i18n

Co-authored-by: Jesús Espino <jespinog@gmail.com>
Co-authored-by: mattermod <mattermod@users.noreply.github.com>

app/channel.go

@@ -527,7 +527,16 @@ func (a *App) GetGroupChannel(userIds []string) (*model.Channel, *model.AppError
 func (a *App) UpdateChannel(channel *model.Channel) (*model.Channel, *model.AppError) {
 	_, err := a.Srv().Store.Channel().Update(channel)
 	if err != nil {
-		return nil, err
+		var appErr *model.AppError
+		var iErr *store.ErrInvalidInput
+		switch {
+		case errors.As(err, &iErr):
+			return nil, model.NewAppError("UpdateChannel", "app.channel.update.bad_id", nil, iErr.Error(), http.StatusBadRequest)
+		case errors.As(err, &appErr):
+			return nil, appErr
+		default:
+			return nil, model.NewAppError("UpdateChannel", "app.channel.update_channel.internal_error", nil, err.Error(), http.StatusInternalServerError)
+		}
 	}
 
 	a.invalidateCacheForChannel(channel)
@@ -2326,7 +2335,16 @@ func (a *App) MoveChannel(team *model.Team, channel *model.Channel, user *model.
 
 	channel.TeamId = team.Id
 	if _, err := a.Srv().Store.Channel().Update(channel); err != nil {
-		return err
+		var appErr *model.AppError
+		var iErr *store.ErrInvalidInput
+		switch {
+		case errors.As(err, &iErr):
+			return model.NewAppError("MoveChannel", "app.channel.update.bad_id", nil, iErr.Error(), http.StatusBadRequest)
+		case errors.As(err, &appErr):
+			return appErr
+		default:
+			return model.NewAppError("MoveChannel", "app.channel.update_channel.internal_error", nil, err.Error(), http.StatusInternalServerError)
+		}
 	}
 	a.postChannelMoveMessage(user, channel, previousTeam)