Migrate GetAllChannels and GetAllChannelsCount from ChannelStore to r… (#14765)

* Migrate GetAllChannels and GetAllChannelsCount from ChannelStore to return plain errors

* Moving i18n translations to the correct place

Co-authored-by: Jesús Espino <jespinog@gmail.com>

app/channel.go

@@ -1563,7 +1563,12 @@ func (a *App) GetAllChannels(page, perPage int, opts model.ChannelSearchOpts) (*
 		NotAssociatedToGroup: opts.NotAssociatedToGroup,
 		IncludeDeleted:       opts.IncludeDeleted,
 	}
-	return a.Srv().Store.Channel().GetAllChannels(page*perPage, perPage, storeOpts)
+	channels, err := a.Srv().Store.Channel().GetAllChannels(page*perPage, perPage, storeOpts)
+	if err != nil {
+		return nil, model.NewAppError("GetAllChannels", "app.channel.get_all_channels.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	return channels, nil
 }
 
 func (a *App) GetAllChannelsCount(opts model.ChannelSearchOpts) (int64, *model.AppError) {
@@ -1575,7 +1580,12 @@ func (a *App) GetAllChannelsCount(opts model.ChannelSearchOpts) (int64, *model.A
 		NotAssociatedToGroup: opts.NotAssociatedToGroup,
 		IncludeDeleted:       opts.IncludeDeleted,
 	}
-	return a.Srv().Store.Channel().GetAllChannelsCount(storeOpts)
+	count, err := a.Srv().Store.Channel().GetAllChannelsCount(storeOpts)
+	if err != nil {
+		return 0, model.NewAppError("GetAllChannelsCount", "app.channel.get_all_channels_count.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	return count, nil
 }
 
 func (a *App) GetDeletedChannels(teamId string, offset int, limit int, userId string) (*model.ChannelList, *model.AppError) {