[TYPO3] <img> in locallang.xml

[Joern Bock]

Hi list,
I'm used to add little images in some locallang files. E.g. to give 
links an arrow or to replace text with a button. Works fine with most of 
the extensions like that

plugin.tt_news  {
   _LOCAL_LANG.de {
     more = <img src="fileadmin/more-arrow.gif">more
   }
}

But there are some extensions like the indexed_search where these method 
doesn't work. I have that example:

plugin.tx_indexedsearch {
   _LOCAL_LANG.de {
     pi_list_browseresults_prev = <img src="fileadmin/prev.gif">previous
   }
}

the output is sadly:
<img src="fileadmin/prev.gif">previous Page1 Page2 ...

I tried
pi_list_browseresults_prev = &lt;img src="fileadmin/prev.gif"&gt;
that doesn't work as well.

How could I possibly add an image to the locallang.xml in the 
indexed_search? Are there some settings to be done?
Best regards
Joern