Merge branch '3.4' into 4.4

* 3.4:
  fix unix root dir issue
  sync validator translation files with master
  fix anchor
  fix links to releases page (formerly known as "roadmap")
  [Console] Don't load same-namespace alternatives on exact match found

Finder.php

@@ -797,6 +797,10 @@ private function searchInDirectory(string $dir): \Iterator
      */
     private function normalizeDir(string $dir): string
     {
+        if ('/' === $dir) {
+            return $dir;
+        }
+
         $dir = rtrim($dir, '/'.\DIRECTORY_SEPARATOR);
 
         if (preg_match('#^(ssh2\.)?s?ftp://#', $dir)) {

Iterator/RecursiveDirectoryIterator.php

@@ -70,7 +70,11 @@ public function current()
         }
         $subPathname .= $this->getFilename();
 
-        return new SplFileInfo($this->rootPath.$this->directorySeparator.$subPathname, $this->subPath, $subPathname);
+        if ('/' !== $basePath = $this->rootPath) {
+            $basePath .= $this->directorySeparator;
+        }
+
+        return new SplFileInfo($basePath.$subPathname, $this->subPath, $subPathname);
     }
 
     /**