I have made some adjustments to the NavHeader which should remove the need for the localized version. Please take a look at how the newer NavHeader template reacts when traversing within the localized segment, such as /de. As you may notice, the new templates 'Next' and 'Previous' will contain a list of the appropriate translated words for each language id.
I plan to add further refinements for the rest of the wiki as needed. I had been attempting to solve the challenges of localizing the wiki when a site malfunction seemed to have taken away all my efforts, but I happen to have run across some breadcrumbs that survived. I have also been away from doing much editing or template work on the wiki for quite some time- at least in part due to sorrow over the loss of hard gained success (with a template relating to localized links).