Add debug log for replacements.

src/search.cpp

@@ -168,6 +168,8 @@ void cleanup_text(string &text)
             pos = text.find('>', pos) + 1;
         }
 
+        DEBUGLOG << "Replacing '" << text.substr(pos, endpos - pos)
+                 << "' with '" << replacement << "'.";
         text.replace(pos, endpos - pos, replacement);
         pos += replacement.length();
     }