Update app.py

app.py

@@ -49,7 +49,7 @@ def realign_word_timestamps(waveform_16k, words, whisper_start, whisper_end):
 
         clean_words = []
         for w in words:
-            token = "".join(ch for ch in w["word"].upper() if ch in align_dictionary)
+            token = "".join(ch for ch in w["word"].lower() if ch in align_dictionary)
             if token:
                 clean_words.append((w, token))