Two fixes:

* Use the encoded word for searches in `<audio>` tags as well as simple links.
* Ignore the case is the Urls. Doing it case-sensitive was kind-of on purpose, but i guess even for German words that differ only in capitalization sound the same.

downloadaudio/downloaders/wiktionary.py

@@ -37,7 +37,8 @@ def __init__(self):
         # description pages. Mediawiki builds 256 (0x100) sub-folders
         # in the style <hex_digit_1>/<hex_digit_1><hex_digit_2>. Look
         # for that pattern.
-        self.word_ogg_re = r'/([a-f0-9])/\1[a-f0-9]/[^/]*\b{word}\b[^/]*\.ogg$'
+        self.word_ogg_re = \
+            ur'/([a-f0-9])/\1[a-f0-9]/[^/]*\b{word}\b[^/]*\.ogg$'
         # This seems to work to extract the url from a <button> tag's
         # onclick attribute.
         self.button_onclick_re = '"videoUrl":"([^"]+)"'
@@ -72,8 +73,8 @@ def download_files(self, word, base, ruby, split):
                 continue
             # We look for links to ogg files (and not the description
             # pages) that contain our word.
-            if re.search(self.word_ogg_re.format(
-                    word=re.escape(u_word)), href):
+            if re.search(self.word_ogg_re.format(word=re.escape(u_word)), href,
+                         flags=re.IGNORECASE):
                 ogg_url_list.append(href)
         # Next, look for source and src. Seen those inside audio tags.
         # I'm not sure if this is any use, but i guess it does no harm.
@@ -86,7 +87,8 @@ def download_files(self, word, base, ruby, split):
                 continue
             # We might have other source tags, for whatever. Use the
             # same re as above. Should work out fine.
-            if re.search(self.word_ogg_re.format(word=re.escape(word)), src):
+            if re.search(self.word_ogg_re.format(word=re.escape(u_word)), src,
+                         flags=re.IGNORECASE):
                 ogg_url_list.append(src)
         # At least from fr.wiktionary.org i got a <button>.
         button_list = word_soup.findAll('button')