Minor code (elseif) fix

Author: lbfeenix

src/Loader/PoLoader.php

@@ -30,8 +30,7 @@ public function loadString(string $string, Translations $translations = null): T
             ) {
                 if (substr(trim($nextLine), 0, 1) === '"') { // Normal multiline
                     $line = substr($line, 0, -1).substr(trim($nextLine), 1);
-                }
-                if (substr(trim($nextLine), 0, 4) === '#~ "') { // Disabled multiline
+                } elseif (substr(trim($nextLine), 0, 4) === '#~ "') { // Disabled multiline
                     $line = substr($line, 0, -1).substr(trim($nextLine), 4);
                 }
                 $nextLine = next($lines);