getPathWithoutLanguage, remove split-slice-join pattern (#16914)

Co-authored-by: Vanessa Yuen <6842965+vanessayuenn@users.noreply.github.com>

Author: heiskr

lib/path-utils.js

@@ -71,11 +71,7 @@ function getPathWithLanguage (href, languageCode) {
 // remove the language from the given HREF
 // /articles/foo -> /en/articles/foo
 function getPathWithoutLanguage (href) {
-  const newHref = href.match(patterns.hasLanguageCode)
-    ? '/' + href.split('/').slice(2).join('/')
-    : href
-
-  return slash(newHref)
+  return slash(href.replace(patterns.hasLanguageCode, '/'))
 }
 
 function getPathWithoutVersion (href) {