epub converter: small fix

src/html_epub_preprocessor.py

@@ -339,7 +339,7 @@ def unwrap_structural_tags(body_tag):
 
     for s in body_tag.find_all("figure"):
         s.name = 'p'
-        s.attrs['style'] = "text-align: center;"
+        s.attrs['style'] = "text-align: center;"  # to center image inside this tag
 
     for s in body_tag.find_all("figcaption"):
         _add_span_to_save_ids_for_links(s)
@@ -493,6 +493,7 @@ def _prepare_formatted(text):
     text = text.replace(">", "\x3E")
     text = text.replace('\t', "\xa0 \xa0 ")  #    
     text = text.replace(' ', "\xa0")
+    text = text.replace('𝑓', "\xf0\x9d\x91\x93")
     return text