BUG SUMMARY:
The placeholder in the search field is hard coded to "Search" and not translated
Since the "Search" string is in the language file, there shouldn't be a need for this.

To remedy this:
Find the file:
ROOT/modules/mod_community_toolbar/tmpl/default.php

In this file, on line 60, find:
<input type="text" class="form-control" placeholder="Search" id="keyword" name="q">

change to:
<input type="text" class="form-control" placeholder="<?php echo JText::_('COM_COMMUNITY_SEARCH'); ?>" id="keyword" name="q">