Preconditions
Make sure to have more than 50 operation logs.

Steps to reproduce

1. In Cockpit, go to operation log page
2. Click on Button "Load more log entries..."

Observed behavior

• No indicator, that the next batch of operation logs is currently loaded
• The user can still click on the button "Load more log entries..." although currently the next batch of operation logs is loaded

Expected behavior

• A loading spinner within the button is shown
• The button is disabled until the requested batch of log entries is loaded