Fix lookup for some words

For some words, like 'nutritive', the lookup failed because there's no
&lt;side&gt; tag with hc=0 attribute in leo.org's XML output, but rather two
with both &lt;side&gt; tags having hc attributes set to 1.

Fix this by not looking at the "hc" attribute, but using the &lt;side&gt;
tags and the words in them directly.

    $ ./leo nutritive
    translating to: ende
    nutritive   ernährend
    nutritive   Ernährungs...
    nutritive   Nähr...
    [...]