Does ShortPoint support right-to-left (RTL) text?

Yes. ShortPoint supports whatever site language it is installed into. RTL (right-to-left) is supported on right-to-left language sites. 

Please refer to our solution Modify SharePoint Regional Settings to Use Further in ShortPoint Elements to check and set up your site language. 

Also, ShortPoint Supports SharePoint Multilingual Pages. You might find it useful, in case you have a multilingual company.