Translate Edu Knows Theme


I just translate the Edu Knows Theme but I can not find how to change the text that is inside the search form that says "Search keyword here".

I've been researching and I know it is a form#mysearch input.sbar, but I can not find how to modify the text value.

I mean, when I click on the Browser option "Inspect Element", I can see this information:

<input name="s" type="text" class="sbar" value="Search Keyword Here" onfocus="if (this.value == 'Search Keyword Here') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Search Keyword Here';}" size="10" tabindex="1">

I want to translate this value into Spanish: 'Search Keyword Here', but I can not find the way to do it. could you be so kind to tell me how?

I would also like to know how to remove the theme function to register the RSS feed and Twitter updates.

Thank you.