Migrate custom website to improve

General information for the website: it is our image
Num. of web pages/modules: 5
Description of requirements/features: we want to move from the actual website to other (web, mobile, etc), i think this is responsive.
http://www.kbscorp.com/

It should work in website(IE, Mozilla,Chrome, Safari, Opera)
Multi language
Specific technologies required: please sugest
Extra notes: Source website http://www.kbscorp.com/
It is php
We have it in git
We have a develop environment.
We want that all work should be using best practice.
4 static page
1 page is dynamic