Add a Left-to-Right mark to prevent breaking interface with RTL text

[bjesus]

Hello!
I was wondering if it would be possible to add a Left-to-Right Unicode mark to the border symbols, as it would prevent breaking of the interface when it prints Right-to-Left text on an RTL-supported terminal.

That's what happens currently when the terminal flips the whole line to RTL mode.

Adding this LTR mark basically just means printing \u200e before each border symbol and should have no effect, AFAIK, on LTR-only users.

Thank you!