Add RTL languages support

For using the software with languages that are written from right to left (Arabic, Persian, Urdu, Uyghur and Hebrew) there is a need to have the interface direction change.

Few services [1][2] allow modifying the css file to get the RTL changes to put in a custom CSS file. I think a very simple support could be added by allowing user to have custom css styles file in first stage.

  1. https://rtlcss.com/playground/index.html
  2. https://rtl.daskhat.ir/
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