Added SHORTCODE to create a language switcher on the site.

Added SHORTCODE to create a language switcher on the site. This code is installed in responsive templates as well. To enable language switching, you need to place the {HOTENGINE-SC:langmenu} code, and also select the available languages in the settings, in the "Languages and start page" tab, "Available languages".

Added new template with demo and quick install.
Added a function to display the values selected in the search filter at the top of the page.
Added two additional options when importing products.