Feature Request: add Right to Left (RTL) suuport

[A Didar]

Dear Editor,

Thanks for this amazing program, TreeSheets is very good application. But unfortunately does not support Right to Left (RTL) text, and this means that the program is not completly good for RTL languages like Arabic, Persian, and so on. I hope you consider this issue and solve the problem.

Sincerely,

Didar