regex replace

Former-commit-id: 6c1f8d43c7faf4dbb3392538f31ddbd7eca16d13

SRT.py

@@ -402,7 +402,8 @@ class SRT_script():
         for word in keywords:
             for i, seg in enumerate(self.segments):
                 if word in seg.source_text.lower():
-                    seg.source_text = seg.source_text.lower().replace(word, term_enzh_dict.get(word))
+                    seg.source_text = re.sub(r"{}(s|es)*".format(word), term_enzh_dict.get(word), seg.source_text, flags=re.IGNORECASE)
+                    # seg.source_text = seg.source_text.lower().replace(word, term_enzh_dict.get(word))
                     logging.info("replace term: " + word + " --> " + term_enzh_dict.get(word) + " in time stamp {}".format(i+1))
                     logging.info("source text becomes: " + seg.source_text)