Make it obvious that a new cronjob needs to be applied

[Kimmax]

Adding a new cronjob via System -> Settings -> Cron does not automagically write it to crontab. This behavior could be miss-leading, since the button on the "Add pane" says "Save Changes".
We should either apply the changed cronjob immediately or make it really obvious that changed / new cronjobs need to be applied using the "Apply" button. Right now it looks like the button serves a reload or should be used when changing the "Enabled" checkbox

[Kimmax]

From IRC:

Kimmax: how about we pull in the "Configuration changed" notification from the fw?
Kimmax: The cronjob configuration has been changed.
Kimmax: You must apply the changes in order for them to take effect.
Kimmax: with the apply button right next to it
fitch: there is no unified implementation of that, which means we need to clutter every MVC page
fitch: we could show in JS maybe, but the state then is not persistent if you reload the page
Kimmax: adding that the apply button is necessary on the page as description or something should do the job for starters

[monreal]

Thanks... I ran into this myself today and never noticed the apply button :(