Are you trying to delete the translations from a specific language only or are you looking to fully delete all translations and remove or restart with WPML?
There is also WPML RESET which is located in WPML->Support->Troubleshooting->RESET WPML, however, that will remove all translations from all languages.
Regarding the forever loading issue --> right click -> inspect and review the console tab, do you see any errors there?
I'm glad to hear you were able to resolve the issue!
We try to keep each ticket to 1 issue, if the following does not help resolve the issue with the menu items, please let me know your results and I will split it into it's own thread.
Please review this documentation on how to translate the Jet Engine menu with WPML
hidden link
Also, review the following Errata documentation on a known issue we are currently having with this plugin: