feat: clearer support for language prefixes

[KycKyc]

If project have to use subdirectories (lang prefixes), like:
example.com/user - for English
example.com/de/user - for German
example.com/ko/user - for Korean

We will face some problems:
if /user node is children of / node as well as children of /ko node.
When code will try to find a match for /user by going through / node, it will slice / from /user segment, so at the next iteration code will try to find a match for user instead of /user, thus will return null as result.

So my proposal is to change literally one line of code, this shouldn't break anything, if i understand everything right.