v1.4.1

• i18n: polish translations added, thanks to @jakub-jedrusiak.

Bug fixes

• Fixed displaying variable class in View tab (fix #64).
• select_group_server() : fix update inputs when multiple = FALSE.
• filter_data_server() : sorting choices in select menus (select, picker and virtual) (fix #66)).
• filter_data_server() : don't use </> for empty field to not confuse to an HTMl tag (fix #65)).