Hi there,
Open ja_wisteryja_templatetools.php file, at about line 88, find following code:
foreach ($this->_ja_screen_sizes as $ja_screen_size) {
$i++;
echo "
<a><img style="cursor: pointer;" src="".$this->templateurl()."/images/user-screen".$i. ( ($this->getParam(JA_TOOL_SCREEN) == $ja_screen_size) ? "-hilite" : "" ).".".$imgext."" title="$ja_screen_size screen resolution" id="ja-tool-$ja_screen_size" onclick="switchTool('".$this->template."_".JA_TOOL_SCREEN."','$ja_screen_size');return false;" /></a>
";
Here you can see a red text. you only translate screen resolution text. narrow and wide text are default of template.