Installer should explain what to do with cron key (show path)

[DBJRdev]

The installer asks for a cron key or even allows to generate one, but it doesn't say what it is used for. You need to figure out from other sources, where to put it afterwards.
=> Installer should already contain the information on how the path to the cron script should be put together

[mbohal]

I have modified the field description to include the sentence:

The cronjob must be configured to trigger a HTTP request to the URL: <your.domain.com>/cron/execute/key/<cron_key>.

This is going to break all translations. Could @DBJRdev please supply the german translation?