Remove google prefs link for mismatched language queries

Queries performed in a different language than what is configured
contain a result div that prompts the user to configure their language
preferences using google's preferences page.

Since we want all language configuration to occur on Whoogle only, we
can safely remove this result div.

Fixes #444
Fixes #386

app/filter.py

@@ -443,18 +443,39 @@ class Filter:
             None (the tag is updated directly)
 
         """
-        link_netloc = urlparse.urlparse(link['href']).netloc
+        parsed_link = urlparse.urlparse(link['href'])
+        link_netloc = ''
+        if '/url?q=' in link['href']:
+            link_netloc = extract_q(parsed_link.query, link['href'])
+        else:
+            link_netloc = parsed_link.netloc
 
         # Remove any elements that direct to unsupported Google pages
         if any(url in link_netloc for url in unsupported_g_pages):
             # FIXME: The "Shopping" tab requires further filtering (see #136)
             # Temporarily removing all links to that tab for now.
+
             parent = link.parent
-            while parent:
+            if 'google.com/preferences?hl=' in link_netloc:
-                p_cls = parent.attrs.get('class') or []
+                # Handle case where a search is performed in a different
-                if parent.name == 'footer' or f'{GClasses.footer}' in p_cls:
+                # language than what is configured. This usually returns a
-                    link.decompose()
+                # div with the same classes as normal search results, but with
-                parent = parent.parent
+                # a link to configure language preferences through Google.
+                # Since we want all language config done through Whoogle, we
+                # can safely decompose this element.
+                while parent:
+                    p_cls = parent.attrs.get('class') or []
+                    if f'{GClasses.result_class_a}' in p_cls:
+                        parent.decompose()
+                        break
+                    parent = parent.parent
+            else:
+                # Remove cases where google links appear in the footer
+                while parent:
+                    p_cls = parent.attrs.get('class') or []
+                    if parent.name == 'footer' or f'{GClasses.footer}' in p_cls:
+                        link.decompose()
+                    parent = parent.parent
             return
 
         # Replace href with only the intended destination (no "utm" type tags)