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• This is not a feature request
• This is not an image-provider request
• I have searched the issuetracker if the issue is not already reported.

Describe the bug:
I installed the app but the default background image stayed the same.
In "Appearance and Accessibility" After checking the background images the section "Random image" doesn't contain any meaning full text - beside what is visible on the screenshot.
In "Theming" saves that where made are lost after reloading the page.

The result neither log screen nor dashboard have a random image.

To Reproduce:
Steps to reproduce the behavior:

1. Install app on Nextcloud 29
   2a. Click on 'Appearance and Accessibility'
   2b. Scroll down to 'Random Background Images'
   2c. See error
   3a. Click on 'Theming'
   3b. Scroll down to 'Splash: Random Background Images'
   3c. Change something
   3d. Reload website
   3e. See error

Screenshots:

Server:

• Nextcloud version: 29.0.0.19
• Splash-App version: 2.2.1