Update - minor foreign management UI updates

[Gehrkej]

Description:

A simple PR for some UI updates for the Foreign Requests segment.

• added text to each tab when there is no elements to be rendered
• improved the viability of the email input on the invites tab.

closes #333 closes #332

Screenshots:

[Gehrkej]

We could add more details to other screens if needed but I think it was important to add something to these blank screens