Joomla virtuemart small issues project

We got new joomla website which is recently updated , but still missing important stuff which needs to be fixed , enhanced or styled better. Site supposed to be adaptive , so we must be sure that that's ok . Main issues: articles links , its seems i cannot change the links .Site is in Dutch, so links must be in Dutch too, Normally you can do string replace in Mysql but what I try, its not working, even with cache off. If you can explain me how to change the links, i can do that myself , because is Dutch articlles login / registering must be added in shop page, and invoice nicely made with logo. SEO Settings not work. I cannot add html behind the links, and /nl can be killed,after the domain name because site is only Dutch We got menu Afspraak, which means appointment, we need a custom form for that, and that way we can sent them to that page to create appointment with details about phone etc Joomla is Joomla 3.4.8 Virtuemart is VirtueMart 3.0.12 PHP Version 5.5.27 if this shop is ready we can change all prices for repair, and add the phone parts in the shop to sell, already taking a very long time Ten we got 5 more shops to do, but one by one because of budget.