Chat icon covers footer in small screens on rtl

[LeandraH]

Describe the Bug

When on a rtl language setting and in a mobile screen, the chat icon is horizontally centered instead of on the left, and thus covers the footer.

Steps to Reproduce

1. Make your browser window small enough to see the mobile view
2. Go to 'http://localhost:9000/testumgebung/ar'
3. See that the chat icon is centered at the bottom
4. Scroll down to the footer
5. See that you can't click on the footer

Expected Behavior

The icon should be on the left and the footer accessible.

Actual Behavior

The icon is centered and the footer can't be clicked.

Additional Information

[f1sh1918]

Maybe we should set for mobile mode the button above the footer and not on the footer. On Smaller devices the underlaying toolbar icons will not be clickable
Additionally another small issues could be addressed like the margin-left on the button to a margin-inline-start