We did at one stage consider allowing either language but it gets impossibly messy when the Faruma font doesn't display latin characters and Dhivehi runs right to left. The user can switch betwen English and Dhivehi, although free text fields must be completed in English. If possible could the fonts be changed to Faruma which can be downloaded from here. The fonts at Dhivhei Wikipedia and Wiktionary are not webfonts.
Here are the fonts used in this app in action see screenshots : 1. Here is the official and widely used font.