You have "Collection" in two places that I can see:
The URL can't be changed, but the title on the Sidebar is controlled by your Theme Language settings.
You can get to it by heading to Online Store > Themes then clicking on the [...] button to get the 'Edit Language' button to head into Translations.
From there, you can click on 'Collections' and scroll to Sidebar, and there it is. :)
If I missed an area, let me know!
|2 hours ago|
|3 hours ago|
|4 hours ago|