Add missing ASCIIMath-fi to braille_mathml. Partially addresses #498.

Author: NSoiffer

src/braille.rs

@@ -52,6 +52,7 @@ pub fn braille_mathml(mathml: Element, nav_node_id: &str) -> Result<(String, usi
             "Swedish" => swedish_cleanup(pref_manager, braille_string),
             "LaTeX" => LaTeX_cleanup(pref_manager, braille_string),
             "ASCIIMath" => ASCIIMath_cleanup(pref_manager, braille_string),
+            "ASCIIMath-fi" => ASCIIMath_cleanup(pref_manager, braille_string),
             _ => braille_string.trim_matches('⠀').to_string(),    // probably needs cleanup if someone has another code, but this will have to get added by hand
         };