Rebuild update counter

[ajotka]

Hi :)

I rebuilt the update counter.
When it detects available updates, it saves the update version to the database.
Version checking now takes place only when someone entering the cloud blocks tab in dashboard and once per day using cron.

I also improved some translations and typos.

Before merge, please check if cron works as it should.

[foadyousefi]

Thanks for great PR. There are some issues:

1. register_activation_hook and register_deactivation_hook must be called from the plugins entry file, in our case, its cloud-blocks.php in the plugins root folder.

2. Creating cronjobs on activation hook is the correct way, but what about those who already activated the plugin? In this case, I think it might be good if it was hooked to upgrader_process_complete action which fires after plugin update.

3. In the Activator.php file on line 17, you forgot to change $current_db_version. Just change it to a higher number than the current number. This makes sure if there are any changes in the database schema.

4. You forgot to add class to add_action( 'cron_check_updates', 'check_updates' ); in Explore.phpfile. If you are adding an action hook inside a class method, you must add callback as an array. This action should be like:add_action( 'cron_check_updates', array( CLASS, 'check_updates' ) );`

And thanks again for great pull requests

[ajotka]

Hi :)
Thank you for the review!

I fixed those things.

1. I moved hooks to entry file and I added init action for wp cron (but calmly, cron events will not be duplicated). - Tested. Works on upgrade, activate and removed on deactivate.
2. As above. 'init' action resolved this problem.
3. Changed.
4. Fixed.

I tested, WP CRON works. Calling the method after entering the cloud blocks tab also works.
In addition, I changed the changelog and increased the version to 1.1.4 everywhere.