Sugar test converter

Invalid date

v5:
-Languages added: French, Spanish, Dutch and Arabic.
-Minor bugs fixed
-Thanks to Art Putman, Mjose Carrera Nortes, Robert Durant and lolote fu for healping me improve the app.

v3:
-add a reference page for the normal blood sugar range.
-fix minor bugs.
p.s, thanks to Mr. Andreas Holzhofer for his support,may God bless you.