Admin Panel: misc. presentation corrections

[toconnell]

• [x] everything in the modals is centered now; that needs to be fixed.
• [x] there's some overlap between the linker and the description now:

[toconnell]

Fix this too:

[toconnell]

This button is still messed up on the panel as well:

[toconnell]

These are all resolved in the next release of the API.