make changes in existing wordpress website

The site [login to view URL] requires several changes as follows: 1. The site should fit a mobile device. The default width should be 480 removing the left part on a mobile device. Chrome browser is the default browser for the mobile device and Dolphin browser should also be supported 2. In the current site most pages are written in PHP so changed using wordpress management tools are impossible. It is required that almost all pages will be revised so that the text can be changed with wordpress editor 3. International support: a menu with language selection is required. Languages should be added include English, Hebrew (which will change all pages to left to right) and Spanish 4. PayPal page should be re-written with support for a regular credit card and PayPal payments