Merge pull request #4103 from crazyserver/MOBILE-4470

MOBILE-4470 design: Add serif fallback font for km language

Author: dpalou

src/theme/theme.design-system.scss

@@ -3,6 +3,8 @@
 @import "theme.dark.scss";
 
 html {
+    // Add serif fallback font for km language in some devices.
+    --ion-font-family: var(--ion-default-font), serif;
 
     // Variables in the design system should be named using the following pattern:
     // SYSTEM-CATEGORY-CONCEPT-PROPERTY-VARIANT (where the only required part is SYSTEM)