reduce backspace delay

templates/browser-detect.html

@@ -225,7 +225,7 @@ if ('speechSynthesis' in window) {
                             var current_time = Math.round(Date.now())
                             console.log(current_time - last_letter_time)
                             if (previous_result == current_result) {
-                                if (current_time - last_letter_time > 1000) {
+                                if (current_time - last_letter_time > 250) {
                                     last_letter_time = current_time
                                     word_list.pop()
                                     console.log(word_list)