[MU4 Issue] Change "Frame" (in Properties panel) to "Border" (to avoid confusion with layout frame)

Describe the issue

"Frame" is used in two different contexts in the program UI. Firstly in the context of text/vertical/horizontal frames; and secondly as a property in the "Text" section of properties. This is potentially confusing for users and forces a workaround in the documentation.

IMV, a solution is to change the word "Frame" in the "Properties" panel to "Border". This would remove the ambiguity, and free up the word "Frame" for exclusive use as a layout device.