Various updates

* Language file corrections
* Active true / false added to pages and cats - This is used to set an active class in the header for pages and categories
* Added '+' to option text - This shows that the option price is additional to the base price
* Alt text added to thumbnail JS
* Products page updated - Includes alt text for thumbnail (additional) images, correct formatting
for product options (checkboxes, radios etc), better styling for product description and related products, and removed redundant related products code
* Small spacing fixes (consistency)