Change search box label to 'search installed plugins' for clarity. props jane, duck_, fixes #13518.

git-svn-id: http://svn.automattic.com/wordpress/trunk@14851 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/plugins.php

@@ -674,7 +674,7 @@ function print_plugin_actions($context, $field_name = 'action' ) {
 <p class="search-box">
 	<label class="screen-reader-text" for="plugin-search-input"><?php _e( 'Search Plugins' ); ?>:</label>
 	<input type="text" id="plugin-search-input" name="s" value="<?php _admin_search_query(); ?>" />
-	<input type="submit" value="<?php esc_attr_e( 'Search Plugins' ); ?>" class="button" />
+	<input type="submit" value="<?php esc_attr_e( 'Search Installed Plugins' ); ?>" class="button" />
 </p>
 </form>